I don’t think the Israeli strikes will bring on the big one, as they were clearly limited to some nuclear facilities and top commanders and scientists. It may set the Iranian program back for a short time, but it won’t eliminate it. In other words, without active American assistance, it is just another Bibi grass cutting operation, albeit one with far more risks than usual.
As a result, I suspect and hope that the inevitable Iranian retaliation will not be directed at American assets. If that is correct, the war can be contained, because the odious Iranian regime will not be forced to fight for its survival, and Trump (correctly) doesn’t want to be Bibi’s lawn guy.