That's hard to answer. I think it might depend on what leads up to it.
Let's hope it doesn't come to that.
Well IMO at this point it seems to be a very likely option(even if it's a year from now) if not THE most likely option. I don't see how the negotiations can be successful and we certainly can't let Iran get the bomb which they are desperately trying to manufacture. Bombing their nuclear facilities will undoubtably kill hundreds of innocents as some of the nuclear sites are reported to be dug in under residential areas. This may be the reason we haven't done it already because we know we would kill hundreds of civilians and we know doing so might change the political scenario in the country by driving more support to the mullahs and stifling the democracy movement. If this is the case then we need a massive covert program setup to help the pro-democracy forces in Iran. Enough so that they can topple the government within 12-18 months. Also if we are ruling out bombing the nuclear facilities then I hope the massive covert operation is already underway.