If Dallas had to play New England in two weeks, for the Super Bowl...then no doubt, I would go with Dak Prescott.
That just isn't the case now.
Tony Romo has to reprove himself, well before the playoffs. If Dallas wins in Pittsburgh, the Cowboys will be in the playoffs.
But to make it to the playoffs and do well, some things need to occur.
Top of that list, Dez Bryant needs to be brought back into the game plans effectively. If a physical catch is needed to secure a win, Dez is still the person that could best pull that off.
The team is getting little real pressure from the defensive front. But the defensive secondary is doing a good job. New England could push issues against both the offense and the Dallas defense...at present. Red Zone has to continue further, for the Cowboys.
The Cowboys still haven't given up a 100+ receiver or rusher...and that does point a positive direction.
As to a 'weak' schedule, next year's won't be affected more than two games, either way.
The issue for or against Tony Romo being at the helm, will be settled, less injury, well before the playoffs kick off,.