The IMF couldn't take down Bitcoin if it tried. It's too late for that now. It will cost hundreds of millions of dollars to do such a feat, and they'd need to pay a developer that understands Bitcoin enough to write code that launches hostile blocks. Also, they will have essentially deflated the US Dollar by almost 1 Billion dollars because of the amount invested in Bitcoin. Don't worry about this.
I'm not technically savvy enough to have a credible opinion whether an organization like the IMF can possibly threaten bitcoin as a concept, currency, or protocol; I'll leave that to smarter folks than I. However, I am definitely concerned with the influence that something as powerful as the IMF can have on making day-to-day bitcoin usage nearly impossible for laypersons such as myself—by demonizing it globally, turning politicians and political/legal systems against it, polluting academia and media with anti-bitcoin propaganda, shutting down exchanges, etc. In my mind these are bitcoin's weak links and the idea that it's immune to such assaults is extremely naive.
Remember, the global banking cartel does not fuck around—this group (the IMF, World Bank, BCCI, BIS, and their satellite network of central banks) has decades of experience bringing entire economies to their knees. Despite their laughable protestations to the contrary, they have virtually unlimited resources to bring to bear should they choose to do so... they own the printing presses!
