I think that last drive really boosted Rosier's confidence. Not that it was lacking before e.g. pumping up the FSU crowd, but I think going into Doak and leading that game winning drive showed him that he can beat anyone anywhere and it doesn't matter who's playing WR.
As for which WRs will step up, I'm picking Harley as the guy. He's more likely to step into Richards' actual spot on the field.
Yeah - previous to FSU, Rosier had confidence - but post-FSU - he got validation - proof - verification.
It also gave proof to our other players that UM football is real, and they can pretty much write their own ticket - if they really, really want it.