Good point. I agree that the coaches would, ideally, do all they can to preserve Maurer's RS.
However, if Maurer wins the backup spot outright and is that much better than Shrout, I think the coaches will probably want to get him as much experience as possible. Say they make sure to get him snaps in 3/4 of our OOC games and then JG gets banged up the last 2-3 weeks of the season again, then we wouldn't be in a position to burn his RS. This is all very hypothetical, of course.