Will be really interesting to see how One X holds up, being that technically it still stacks up pretty darn well for it's age. However I dont see support continuing much beyond the normal 1-3 years to find out.
I suppose I'm planning on selling mine when I get an XSX, even though I dont expect it to fetch more than perhaps $100.
XSS seems overwhelmingly popular on forums and twitter, I am definitely in the huge minority here. I still do not like the concept and think it will die off, but maybe I'm wrong. I still see an even bigger issue of what to do when inevitably the big brother starts seeing price cuts, as it will be hard to reduce the XSS much, although the 512SSD will help I think.
While I do like the form factor, the idea of low resolutions means I just could never seriously consider an XSS as my only Xbox personally.
I know a guy who has literally like 10 Xbox One's alone. He's quite an odd fellow, he will buy many themed Xbox's for no real reason. I will definitely see him buying an XSS lol, just because it is different. He also has a One X, but claims to not enjoy using it because of the heat it outputs. Like I said, he's odd, lol.