But if you're going to leave out Skyrim, why the hell would you put in Morrowind and Cyrodiil? We just went to those places. Sure, a Hammerfell or Highrock revisit wouldn't be bad, but only because it's been more than 10 years since we've been there. Valenwood has no cities, so it'd be boring. Summerset Isle is supposedly Embargoing all Imperial goods, so there wouldn't be many other people there besides Altmer, and Elswyr and Black Marsh are just awful places to be. Logically, only Skyrim fits the bill.
That's not logically, that's opinionatedly. It has not been deduced by any generally accepted premises that Elsweyr or Black Marsh or Valenwood are awful places to be. Nor does it logically follow that since the Altmer pre-Oblivion Crisis were embargoing Imperial goods that we can't have a game set there in the indeterminate future after the collapse of the Septim Dynasty.
There are some people out there who might like to see a return to Morrowind, perhaps after its catastrophe or even before the War of the First Council.
Further, there may be those out there that would want a return to Cyrodiil to see the changes that have occurred since the Medes took over.
Not saying the above two are likely, but they're options.
And Morrowind and Cyrodiil are not options that are typically saturated with the most responses. Hence why they are there and Skyrim is not.
And Valenwood has no cities...? Have you seen a map of Valenwood? Have you read A Dance in Fire?
If you don't like the poll, then tough luck, I guess. It's already been explained why it is the way it is.