Those people want the ECW of the 90's back. ECW under Vince would be stocked w/ WWE guys, and would most likely feature WWE "hardcore" matches. That's not what the people who chant "E-C-W", the people buying the DVD's, the people ordering the PPV want, and when they don't get it, they'll stop watching it.
The only way to get it to work would be to totally divest WWE from it (save for financing), and let someone like Heyman be totally in control. Vince will never do that, not to mention that USA Network would never even allow a "real" ECW from going 100% hardcore.
They'll be better off milking the nostalgia and selling DVD's than they would be by bringing back ECW.