First off, define a franchise QB v an elite one. Brees, Rodgers and Wilson are considered elite and each has one ring while E, Manning has two. Kelly, Marino and Tarkenton were considered elite and don't have a ring between them but I cannot make the argument that I will make about this team against the Bills and Vikings as they had complete teams.
The Cowboys could have/had Brady, Brees, Mahomes or Rodgers and still not have a trophy beyond 1995 or even a trip to the NFCCG because there is a fatal flaw, the inability to build a complete team. They cannot adequately identify even what they need, prioritize the positions.
Does it really matter what they do with Prescott or trade for Wilson or draft one? Is this QB the reason they haven't advanced in the playoffs?
There are 3 things necessary for any team to win the championship:
1. They must identify what will get them there and what is keeping them from getting there. This all about personnel, coaches and players, but begins with the owner hiring the GM.
2. They have to want it badly enough to do whatever is necessary to address and resolve issues with #1.
3. Luck. No team wins it all without some luck on their side.
I do not think the Cowboys can do #1 but I know for certain they are incapable of #2.
Doesn't matter who the Cowboys have at QB or how much they pay him as long as they continue to run the team as they do.