Doesn't Valenwood suffer from most of the same problems as Summerset anyway? I'd imagine none Bosmer, Altmer or Khajiit wouldn't exactly be welcome there either.
If I recall correctly, there are human settlements in Valenwood as well as a sizable Orc population in the capital. Of course, that was before Valenwood became Mainland Alinor, so how knows what the situation is like there now. Since the Thalmor backed the An-Xileel during their bid for independence, the Argonians might be tolerated as allies to Alinor.
Even if non-Altmer/Bosmer aren't welcomed, all the better I say. I think it'd be interesting if the oppressive nature of the Thalmor regime has an impact on the player if he's not one of the elite. Maybe the Thalmor are apply some sort of
dhimmi to non-mer who live in Alinor. Bonus points if game imposes this tax on the PC too if he's not an Altmer or Bosmer. Maybe once a month you get a message that its time to pay up, and if you don't get to a designate spot within a few days, you get a sizable (but not kill-on-sight by itself) Bounty.
However, in such a case, I'd also like to see player get some Altmer/Bosmer-only options. For example, treated better by the authorities and easier access to some exclusive Thalmor questlines (non-Altmer/Bosmers would have to jump through a lot of hoops, such as doing a ton of Radiant quests for the Thalmor before he earns their trust--conversely, an Altmer/Bosmer would have to jump through similar hoops to join whatever underground resistance movement exists).