Nope. I find the MQ to be responsible for the destruction of Morrowind. All the other parts were for fun.
Technically yes, but it goes back much further than that. Like, 3600 years back, with Dagoth Ur going cooqoo and joining Almsivi in stolen divinity. Granted, the Nerevarine Prophesies may have been made and fulfilled anyway, but I doubt it, not with there being no immediate, epic threat to Azura's people (that could be reasonably predicted by any of us fans).
Were Ur to have failed way back in the First Era, or just not lost his marbles, the Tribunal would still be basking in the uber-powerful rays of the Heart of Lorkhan, and, of course, no rock of any size would be a problem for them. Especially since there'd be no Ghostfence to be maintained.
So, I suppose the People-Of-The-Root owe Dagoth Ur a thank you.
BTW, I'm very curious as to who may have survived Landfall. And where is this "200 years 'till next ES game" crap coming from?