Fire Kellen , and Prescott wont be the same.
Guaranteed .
Nope, he'll be different.
Not better, though. He's had 7 years, if he hasn't gotten to the level needed by now, he never will.
But the Cowboys are at a point where adding a few key pieces, like a Parsons, aren't going to do it. Other players, like Lawrence, e.g. are now on the tail end of thier careers, by the time you add enough pieces, you'll need to replace the Lawrences, et al.
Dallas, like any other team that's not "getting it done", has options to get to SB- winning heights.
However, the option that should be done, can't be, due to Jerry's age. And that is to decimate the team and start from near-scratch. A Walker-type trade would be ideal, but no team is going to fall for that trap with Dallas again, not after a 3 in 4 year SB winning streak. Teams don't like America's Team, never will.
Keep a few young players like Parsons, Lamb, Tyler Smith, Pollard as a core.
Trade (if possible) Lawrence, Martin, Schultz, N. Brown and so forth, stack up as many draft picks as possible, draft a top qb prospect and as many other players as you can, and hope like heck enough of them turn out great to move the team off dead center.
But that would probably take 3-4 years, and at age 80 Jerry will be loathe to do that, would also cut way down on jersey sales, etc. and Jerry does like making money, just another reason not go start over.