I couldn't care less how much Sanchez and Romo play, nor who's on the field with them, starters or backups.
They are both professional football players. You aren't supposed to get hurt just because you get knocked down.
My guess is Dak gets the first quarter, Romo the second quarter, Sanchez the second half. If Romo gets hurt when he's supposedly 100% healed, then all the trade talk should cease, and he should retire. Next year, it's the Dak and Sanchez show with a third QB on the practice squad.