Is what true of shoot style?
That there's no market for it now that the real thing is readily available.
There never was a market for it in the US.
No shoot style promotion has ever been successful in the US on a large scale, unless one wants to pretend that pro wrestling in the 30s or 20s was shoot style (even though it had been exposed as fake regularly by that point). In the TV era, it just hasn't been the case.
MMA really didn't matter. The majority of the country knew wrestling was fake. The majority of the non-kid fans who attended it knew it was fake, and just played along.
I agree with the earlier posters: if MMA fans want to watch MMA, they'll watch MMA rather than Fake MMA Pro Wrestling In ROH. There's so much free MMA on TV, along with loads of MMA PPV, that who would even care to seek out Fake MMA. It's just delusional nonsense of guys like Heyman and Cornette, who have probably been listening too much to Dave, to think Fake MMA Influenced Pro Wrestling is going to draw big. Christ... MMA is having it's issues drawing right now.