No, the current regime is toast. The IRGC is running the show right now, and if we were to stop bombing tomorrow they'd be the de facto rulers of Iran as the mullahs are effectively gone.

Is that a good thing? Likely not; the IRGC is little more than a terrorist army with the power of a nation-state behind them.

The IRGC is the current regime. They've always been a major component of the governance of Iran - indeed, much more so than the military or any other organ of government. They've been the kingmakers and the power behind the "official" Iranian governance for the last several decades, and have pretty much been calling the shots and setting policy at least as much as the mullahs.

csis.org - Iranian islamic revolutionary guard corps irgc iraqi view lost role or bright future

Them "running the show" is the current regime continuing, not changing. They'll just pick more mullahs to run the clerical side once the bombing stops. They have always basically run almost all non-clerical Iranian government policies and functions anyway, as many ostensibly "non-IGRC" positions get filled with senior IGRC members and their allies.

The IRGC isn't "little more than a terrorist army" - they are, and have been pretty much been, the government of Iran to at least the same extent as any other faction within the polity for quite a while now.