Yeah, you're probably right that it wasn't as big chunk of the playbook as the pistol is... but when Cunningham and Vick were getting 100+ carries a year I have to imagine there were pages on pages in the playbook that had to do with them running or related plays like them picking on the spot vacated by the LB spying the run.
Anyway that is beside the point I'm trying to make... I don't think it would be a step back if the 49ers had to fall back on more traditional playcalling. If they can get a guy that can still effectively run the pistol then great, I just don't think it is a requirement for the #2 QB. I guess since they have been developing Tolzien for the last 2 years it is worth trying to find a guy who can run the pistol since presumably the QB whisperer worked some Magic on Tolzien and he is an adequate pocket passer for the traditional plays.
It would be a significant step back. We'd either lose a significant chunk of the playbook or have to re-boot the offense. Obviously a team in our situation (SB contender) takes a huge hit if we lose our QB. Why compound it even more?
I don't know where this faith in Tolzien comes from. People talk about him like it isn't a significant downgrade if he has to play next year.