WAY too early to assess the potential of Dak Prescott. Currently he is in a specialized offense made for him to succeed on offense. It bears NO similarity to what, say for example, is done here. They have a great OL and what seems to be an elite RB, and, to the kid's credit, he's executed it beautifully. HOWEVER......
This is still the NFL, regardless of what Goodell tries to do to it, and cool new offenses are figured out sooner rather than later. Pretty soon what Dallas does will be figured out and Prescott will NOT have the experience to counter it.
I've said it before, what's happening in Dallas is really pretty cool, but to me the REAL story is what that no name Dallas defense has been able to accomplish is the real story. But when teams begin to slow down that Dallas run game, and the defense has to play more snaps, it could also change in a hurry.
In the meantime, I believe that Romo is the best QB on the Dallas roster. That 15-3 record in his last 18 games is telling, ESPECIALLY when it was accomplished when HE was the main focus of the offense. I can understand the sentiment in Dallas to keep Prescott in the starting role. There were more than a few right here who were questioning giving Tom back his job after just 6 quarters of JG's play. let alone 6 games for Dak.
To me, with Romo's issues are in staying healthy, the Cowboys best option would probably keep Prescott in for the immediate future (IIRC- Romo can't come back for a few weeks anyway), and let him go until he hits that inevitable wall and THEN make the change. The fewer games Romo is exposed to injury the more likely he'll be healthy when the playoffs come.
Prescott is clearly Dallas' future at the QB position. After this season, Romo COULD become excellent trade bait for a future is now team like Denver. At first I was worried about having Romo being in the trade market might lower interest in JG and depress his price. But on second thought, people who want JG are looking for a long term QB solution to build a team around. Teams that would be interested in Romo are already good and are looking for a short term fix. It's a completely different market.