IMO the Infantry has pretty much always been training in a way that enhances their combative effectiveness. Alot of PT, Conditioning humps, O courses etc. Ask any 03 who has spent the afternoon on Okinawa doing immediate action drills or fire team rushes until his elbows and knees were bleeding. Or running sprints doing gun drills.
Fact of the matter is that in most companies I was in if you were not 1st class PFT and 20/80 then you were a sh*t bird. If you dropped a run or a hump you were a sh*t bird unless you had a very good reason like being ordered out for injury. The emphasis was on being combative effective physically. As well as tactically sound in your MOS. There were alot of ways to be branded a 10% er.
I don't think your average grunt is going to have a problem with the CFT. I also don't think that it will do much to effect the physical condition of the average grunt.
Me. I see this taking on a certain Pougishness. And being designed to cater to the Support Unit's. I also think that if this is the biggest worry along with the appearance of a Marine in uniform while Marines are in combat zones it's gonna take on a fark-fark game flair. I don't care what percentage of body fat a Marine has or how he tapes out. As long as he can carry his weight and weapon and be combat effective when he gets there.
Maybe the best thing would be to combine it with actual combat skills. But I don't see that happening with Kent ramrodding it.