price has already affect BTC on the localbitcoins in Iran, it was posted by some user in similar thread which the price reaches up to $29K. it didn't affect the whole market though. a war seem overblown though, its not like Iran will blast US but then there is a probability that Iran will be invaded as US usually do it. hope not. Iran doesn't have a local section but if there is it would be a hot big thread here in bticointalk.
I believe so, there could be some downfall in the price if ever war breaks out. And if this conflict rise up to the global scale, bitcoin's value could depreciate heavily as wars and conflicts greatly obstructs technological advance, which means internet, the heart of bitcoin could be at risk. This inevitably could lead to huge losses by investors and common people alike. Let's hope for the best.