I'd be surprised to a degree if ECW continues past December, Sci Fi has things that outdraw it now, and they won't really be enamored with pissing off their hardcore audience with a wrestling product that isn't really getting them ratings. They don't care about ECW true, but like what was pointed out prior, it's a question of what do you think is better? Is it better for Punk to be the number 2 guy on the third brand, or is it better for him to go to RAW or SD! and jerk the curtain or be lost in the shuffle? I think he's probably better developing in ECW and being at the top of that limited heap. He's at least on TV weekly and pushed.
TNA has been treading water and looking like WWE for awhile though, the "Crash TV" approach to me dosen't work, and they've definitely been getting away from the wrestling, if they keep trying to out-WWE Vince, they'll just sink further in the toilet. Vince is the best there is at his form of wrestling, he's cornered the market on it, if you want to gain a foothold, find a way to be different.