There's a reason lemon laws have to be introduced in any market where the costs of discovery are high and the actual value per unit variable: buyers are willing to offer "average" prices, sellers knowing this will never list anything of above average value, as a result the average spirals down. There's always going to be need for a place where the above average can be listed, and that's the end of the p2p market as a serious venue.
P2p works well for money because money is fungible. It's a good idea, much like flight is a good idea: for some applications. Not at all for anything and everything under the sun.
It's in no way a solution, other than for the purpose of continuing to enable the unqualified and inept to scam outright, or to earnestly work towards some innocent end while ultimately losing people's money.
People were trying to use similar approaches after GLBSE fell in, the flurry of related posts since BTCT fell in and worried shareholders are left wondering if its friends are going to follow suit shows it's still a veritable hope-mirage. None of this has any bearing on the facts.
You are on the right track in terms of looking for problems and trying to conceptualize and present solutions, I don't mean to discourage that at all. It'd be a good idea to devote more time and resources to reading up and getting a better picture, tho'.