My personal opinion is that when wall street truly gets it, the bitcoin speculative bubble will make the internet bubble look tiny in comparison.
True, but they won't be happy the 1-block-per-ten-minute throttle will effectively kill any attempt to build a High Frequency Trading system. I on the other hand, am ecstatic about that fact.
Within an exchange, trades are not done on the bitcoin block chain, so there is no ten-minute limit.
It's not inconceivable that should Wall Street get involved, that multiple exchanges will get together and have credit agreements that allow you to transfer between them instantly too -- again outside the block chain.