I think it depends on the nature of the proposal. Some proposals might warrant that type and degree of structured approach, some might not. Maybe Evan's thinking way down the line, like $100,000 projects or something.

Project management is a very people-oriented process. The blockchain is good for actually delivering the funding once it's been approved, but thats all it's good for IMO.

...being a switch.

You know what's a far better decentralised mechanism for all this than anything thats been suggested so far ? (IMHO, of course). That Proof of Labour proposal  

It actually addresses all the concerns being aired here and has them thought through in detail. It also does so in a way that directly amplifies the value of the currency.