I'm letting 90% of my .asia's expire unfortunately. Just didn't take off as hoped. However I did get a couple of lucky sales so am in the black overall & with a few premiums in the bag to keep.
I don't see why SE rankings would be particularly hard for these domains. In fact if the search term contains the term 'asia' in it, I think it would be an advantage. Google def take the extension as well as the domain into account with their algo.