I suspect XT has achieved exactly the effect "they" intended it to. I don't believe the real force behind the XT push ever intended or believed it would gain adoption.
Beat the price of BTC down, FUD and "divide & conquer", mission accomplished.
Except that, in respect of the divide and conquer aspect, I don't think they've accomplished anything. The vast majority of XT supporters are sock-puppet shill accounts, and there aren't that many of them. So for now, there is only the appearance of split community. Just a veneer.