The US is not the center of the world.
I agree. However US citizens are the biggest consumers. Companies, manufacturers, etc. depend on the flow of the USD or future speaking US Bitcoin. Without it the growth or even existence is snuffed out.
Where would China be without the US need?
How are the markets in other countries effected when the US tanks?
How many countries will not make enemies with the US?
How many countries will allow their corporations, banks, etc. deal with US citizens aiding them in doing something illegal to US citizens.
Silk Road, and businesses like it will be the only use for Bitcoin at that point. It will be that "cool" thing that we all did, and made some money from but got scolded like children for doing it. And we will stop because our "Democratic Government" and the "Free" country we live in told us so, for our own protection of course.
Look at Gox, they can't even find a bank willing to help with the transfers to US banks. Nobody wants that kind of risk. Either that or they massively borrowed against the funds deposited on Gox and can not repay their traders fast enough and it's all a giant ponzi scheme.
Just saying keep your eyes wide open, be alert, and have an exit strategy if needed.
I love BTC and am currently creating some pretty cool items around it that I will be introducing next week. I am not slowing down, put I am paying close attention.