Hi,

I read the OP with interest, considering argument #1. It is also the most important threat I see concerning BTC, and those who don't see it are blind. It doesn't mean fatality, but this power really exists.

Here is an interesting point of view about the future of money.  
http://www.youtube.com/watch?v=I8JhmQ73Vq8

I'm more optimistic than OP concerning the future of BTC, but it is not my purpose in this reply, I just wonder how can you compare BTC users growth to Facebooks ? Both of them take place on the grid but IMHO the comparison stops here. Facebook is free and does not require (apparently) involvement. You sign in and you let uncle Sam doing the rest, while BTC by essence is costly, you have to pay for it, then to take care of it, and take the risk on you. Big difference isn't it ? 

drgyoza