Well, I think I have explained several times how I think it makes the experience for stills photographers less pleasurable.
So again:
- there is a real chance of the cameras becoming more expensive due to the extra capabilities
- video recording generates heat, which requires better cooling, probably resulting in a bulkier camera
- The time Fujifilm engineers spend on developing video capabilities can not be spent on stills photography improvements
- adding more functionality makes the electronics and software more complicated. There are enough defects right now already.