I don't think their are any obstacles in exchanging bitcoin to a regulated currency or so-forth.
We should in my honest opinion concentrate on Bitcoin Currency instead of inventing another, you are sure right though. We should work with other emerging currency (doesn't have to be limited to P2P) such as Facebook Credits and such.
The more points of entry or exit, the better.
There are obstacles, like if I wanted to trade bitcoin against any major currencies using the most popular forex trading platform, like MT4/MT5,i will never be able to do so,as acceptance of bitcoin is unlikely in near future by any govt. authorities.