Yes, Iran will obtain nuclear weapons, even if the mullahs are overthrown. Having spent about a quarter of the nations GDP on obtaining credible nuclear weapons capability, do you really think any Iranian regime would simply throw it all in the trash? Israel has illegally nuclear weapons, so Iran has also right to have nuclear arms to stop Israel.
Singapore arrests man who tried to join ISIS (Reuters)
from the article: Bush ordered Pentagon to 'study' for attack on Iran