I could definetly see them putting this in the next generation 86 (without the turbo, of course). I believe it's been confirmed the next major update will be in 2020. So if anything happens, it would probably be at that time.
I personally have no problem with the current stock output. The car is simply a joy to drive, however, the biggest complaint I hear about our platform is about it's lack of straight line speed.
If Toyota/Subaru think they can sell more cars by adding a little more engine, then I'm all for it. An increase in sale numbers can only mean more support, and the continued production of these amazing cars.
LONG LIVE THE 86!