I think the biggest problem of IRGC is that they grabbed a large share of economy but spent a lot of that in geopolitical expansion for the last 1-2 decades. This in turn contributed to a more fragile Iranian economy and high inflation, which makes them extremely unpopular among the people.

No matter who steps up, Trump's actions make clear they have only two options:

1. Permanent subjugation to western countries, to be unilaterally abused whenever they felt like it, or

2. Race to the nuke as fast and as secretly as possible