If the main quest of morrowind, oblivion, and skyrim happened during the same time, how would this effect the storyline? With the Sixth House casting ash storms, oblivion gates opening up, and dragons appearing? and what if their were no dragonborn, nerevarine and CoC to stop these events during this time? how would the story be different?

Just this is being depicted by the various province mods for either Morrowind, or Oblivion, and I have heard Morrowind for Skyrim (TES5) will be started soon. I myself work for two TES3 Morrowind based ones; Province: Cyrodiil and Skyrim: Home of the Nords.

Together with Tamriel Rebuilt and Black Marsh it will complete 50% of Tamriel for Morrowind. I am researching more possibilities on Elsweyr and Valenwood.

They're not talking about simply having the provinces together in one game. They're talking about all the world-ending events happening at once. @OP I'm not sure but I think some of these events actually led on to each other so I'm not sure it's logically plausible.

Who is they? I thought I spoke to only one person.

And three events in one timespan in three different provinces in any setting can be done maybe but what platform would you want to use as the engines might limit you.

I am using "they" as a non-gender specific pronoun reffering to the OP. I am fairly certain it's grammatically correct. EDIT: As can be seen http://en.wikipedia.org/wiki/They, whether this usage is correct is disputed, but it features in many official texts. The engine isn't the issue, since the OP's topic is not about game implementation. It's about the storyline effects of having these 3 events occur at the same time. And the stories wouldn't be entirely seperate, because some things are not isolated to one province. The Oblivion crisis, for example, happened all over the continent.

Are you just here to argue with me or what?

I gave my view from my modders viewpoint nothing else, you better stick with 'them' then.

And if you already know the answer of what they want to hear why do not give it yourself.

I'm not trying to argue, I'm trying to explain what the OP was asking for. They didn't ask "Can Morrowind, Oblivion and Skyrim be implemented in a single game", so answering that question isn't answering the question the OP is asking. I gave the OP the information I knew, which was limited, but it's what they were asking about. There's nothing wrong with your view from a modder's viewpoint except that it's off-topic (As far as I'm aware, Province Cyrodiil and SHOTN are both set at the same time as Morrowind and do not feature the return of the dragons and Alduin's world eating or the Oblivion crisis). I was under the impression that answering the OPs issue was your intention and you were simply misreading the OP, but if you just wanted to post off-topic, I'll not continue this conversation as it's unnecessary.

You totally should apply for moderator then...

I don't believe explaining things to people who appear to have misunderstood them is a moderator's job. Enforcing forum policy is, which is not what I was doing at all. Honestly, this argumentative tone isn't necessary. Let's just move on.

Lore-wise, it could not happen, as these events were prophesied in order in The Elder Scrolls.

BUT if they did happen at the same time, and there was no Heroes to stop them, then the world would end, simple as that.

The world would just end. Not too hard to figure that out.

Impossible. The Oblivion Crisis would never have happened if the Heart of Lorkhan remained in Red Mountain, keeping that Tower active.

However, if we are to pretend the lore would allow all three of these events to happen at once, then Mehrunes Dagon would destroy Tamriel just before Alduin ate the world. That means Dagon would most likely return to being the Leaper Demon King and then the next kalpa would start without all of the things he'd been hording away from Alduin. The Morrowind storyline would be irrelevant.

Unless the Akulakhan could actually have been finished before any of that happened, in which case we could see the incredible fight that would be Akulakhan vs. Mehrunes Dagon! And, hell, depending on how much the Heart of Lorkhan influences Akulakhan, then the giant golem god might have fought off Alduin too. However, I imagine Dagoth Ur would have thought ahead and kept a tight control mechanism over the Akulakhan, so all the mortals would end up becoming crazy immortal ash creatures.

One thing you'd need to consider is that the Oblivion crisis was not limited to Cyrodiil, while the Blight and the Dragon invasion were most likely limited to their respective provinces, so Skyrim and Morrowind would have fared much worse than the rest of Tamriel.

I think they moved the timeline too far ahead with Skyrim. It should have only been like fifty years ahead or a bit after the books ended. I'm suprised I can't find the remains of the oblivion gates in Skyrim - I would wager that while more appeared in Cyrodill than any other province, there should have been a few here and there in Skyrim - one of which Silus would be attempting to obtain for his Museum if you met him before level 20.

Also how awesome would it be if a big prophecy turned out to be wrong? Just when people think they can trust the scrolls' prophecies, the cosmos slips a joker in the deck instead.