Mirrorless, contrary to popular belief, is not about reduced size/weight only. If rumors are valid, the X-T2 will have to go up against cameras such as the D500 (or, at least, the 7Dmk2); namely "sports/action oriented" DSLRs. Even being larger than the X-T1 (dual card slot, need for better cooling, larger grip), it will, nevertheless, be significantly smaller/lighter overall than these systems.
Perhaps a X-E2/X-T1 format camera is better for your needs, although I'm guessing the X-T2, with the appropriate lens selection wouldn't be far off either.