#4. They're still working under one man

Here is probably the biggest barrier and obstacle in the way of Eric Bischoff and Paul Heyman. They're still answering to one man - Vince McMahon. Ultimately, we can't reveal how the nature of backstage interactions are, but when you're at odds with Vince McMahon over ideas, it may not work out too well in the long run.
All the creative disarray and the supposed low morale in WWE boils down to the same man and despite old names and old faces being brought back, the product is still the vision of McMahon and he has the final say as to what is presented.
Cody has no chance against John Cena? Details HERE
So what's the guarantee that he won't be shooting down their ideas on a constant basis? They know McMahon well and know that there's a big possibility of this happening. There may be new (or old) names on the board, but they still answer to the same man.