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"Again, for me personally you're looking at either regime change or some kind of diplomacy/disincentive arrangement"

I would agree those are probably the most likely methods for the problem, but I wouldn't rule out the possibility of an attack just based on the task itself. The point would be to make a dent, and destroy the key elements with a goal of setting their program back to around 1995. That would only require 3-4 key strike points, and as they get further along, the target becomes even more central.

I also think people are a bit caught up in this idea of the US and Israel making this strike, as if they're the only ones with any contention for these developments. If Iran gets their bomb, you will see Afghanistan, and Iraq turn into a ball of insanity.