You could say that, but you'd be wrong. The marriage feature of Fable is universally perceived as a joke.
Well then, explain it for me. Create some sort of graph or presentation, please.
For one thing, if you haven't realized that about a quarter of the ENTIRE point of Fable is to be part joke, then you are missing a good part of the point. Fable is one fourth British Humour at heart, so if you look at certain aspects of the game and giggle and call it pure foolishness, they have achieved at least part of their purpose. While it will certainly offer quirky and comic moments, ES will likely never go the way of being loaded with farts and ass slapping dances, because that is out of keeping with the tone of the gameworld.
Fable had a lot of shortcomings. The fact that you could get married was not one of them.
Fable III had some of the BEST local co-op, drop in/drop out I have seen in ANY game since Baldur's Gate. Fable had some decent clothing options, and some fun relationship options. Sadly, its lore was shoddy, its quests were short, and the creatures were too few.
Marraiges was one of the things people liked about the Fable Series.
It was not the features the Fable series OFFERED that made people gripe about Fable. It was the things the series did NOT offer. The main quests were too short, the side quests were too few in number, some of the interactions lacked depth, some of the relationships lacked frequency.
Seldom if ever have people been heard saying, "I Hate that you could get married in Fable!!!" or "I hate that Fable III allowed my friend to play with me when he came over to visit!"
You DID hear complaints about how short the game was, how few sidequests were offered, how there were not enough replayable quests, and how there wasn't enough lore etc. But where marraige was concerned, you are far more likely to hear people complaining that there were not ENOUGH things to do with your spouse, than to hear anyone complaining that you could have a spouse. I have been on the Fable Forums. You want to know what people complain about in the Marraige department? The fact that their wives didn't WEAR the clothes and Jewelry they bought them, and wouldn't sit down to eat with them, and didn't go to bed in Fable II and III like they did in I and how it broke the verisimilitude etc. etc. etc.
My point in all this? Simple. The ability to marry and have six and relationships is NOT one of Fable's shortcomings, by most people's reckoning. It is not the thing that made those games fall short of many people's expectations ( I do not say failure, because a lot of people enjoyed those games for what they were, and I don't think you can call a game that sells more than 3 million copies in its first year out a failure).
The relationship feature almost certainly is NOT going to ruin Skyrim or any other Elder Scrolls game. Removing features hurts games. Adding features usually only HELPS, unless the added feature causes other well loved features to be cut, or directly contradicts the lore of the game world.