Where are the abandoned houses, loads and loads of them them?
Nah, I applaud the effort to rationalize the liliputean size of Skyrims cities, but that ain't gonna cut it.
And I'd say if no natural disaster was deemed worthy of mention during these 200 years,
it wasn't that big of a deal.
Yes, but there is a difference between the lore world and the game world.
Of course in lore Solitude is bigger than what you see in game, a city like that couldnt even support itself if it was populated like it was in game.
Those people in that climate could handle one farm, that is it.
So what we are talking about here is not lore reasons why there are so few people, it has to do with game mechanics.
A lot of it I think is that we now have NPC's with their own AI, something unknown up to and including Morrowind.
Then there is the fancier graphics and voice acting.
Edit: and the 'Winterhold disaster' is obviously another Sutch city.
Cut due to time constraints.