The fact that Trump started talking about regime change makes me think we didn't hit much in the way of their nuclear program. He's absolutely priming the pump for something potentially beyond the bombings, and I've actually been seeing various arguments break out among the right about whether or not they want us in an extended war with Iran. Hell, a bunch of the right-wing radio/podcaster types are arguing against war with Iran and bitching that Trump campaigned against that, and they are being called "woke" and RINOs by the MAGA faithful.
I have to think Trump isn't dumb enough to actually try and do anything more and get regime change going, because it's clear a fuckload of people on the right don't want it (and the racist ones are bitching that a war with Iran will lead to more Middle Easterners flooding the US). But on the other hand, he threw it out there, unprompted, and seems irritated that people around him disagree with the concept of regime change. And Trump is coming out publicly and saying he's going to primary Republicans in Congress who don't support him on fighting Iran. I don't know if he does that if he planned on limiting the bombings to those three sites.
And with it coming out that we might not have hit everything, he's going to be embarrassed and looking to do something.
Edit: I know he sent Cruz and Rubio and Graham out there to champion a fight with Iran, but even they weren't going so far as to talk about regime change in a positive "let's go kick the leadership out of Tehran" light.
Edit #2: Next year, there are mid-terms. Congressional Republicans don't want a protracted war with Iran, and they will be thinking about it. They don't want American sailors dying to protect Saudi oil or the price of gas going up a few bucks. On the other hand, Trump threatened to primary Republicans who oppose him, so shit's going to get real.