I bought the X-T1 just middle of last year and when I decided to get this body (and the system), I didn't really mind it's not the latest model (X-T10 is) which I know a replacement will come soon. 1 of the main considerations that makes me think this way is that the company keep upgrading the firmware and every time when it does, I see people saying it's like a brand new camera altogether. Personally I don't really feel so, but I do think that they are flaws taken care of and you can visually see improvements, unlike other camera makers.
I'm not sure when X-T2 come out will Fuji stop the firmware support for X-T1. Chances are slim for them to do that. And in the case that they are upgraded to better features in par with the successor (less the hardware upgrades), I think both the usability and resale value of the body is still pretty high.
If the X-T1 can meet your expectation, I believe you should be more worried about items in the rest of the system such as lenses, flashes, accessories etc. That half a year of usage and experience will make you understand the system better. Who knows you may end up ditch the system completely and by then, it doesn't even matter whether is there a X-T2 or X-T3 coming soon.