Brokeragers and stuff exist because the stock market is strongly regulated and only autorized people can trade them. With bitcoin there is no such restrictions, and you can buy bitcoins person to person if you don't want to use exchanges, what you can't do with stocks.
About investment funds with bitcoins, I think its a good idea, and an unexplored market, since crypto trading can be very profitable
I agree, it'll also give people regulated out of the system access to the capital markets.