I think for this to work we would needed a voted contract of sorts. It would be a written agreement detailing the plan conceptually, technically, and financially. There would be a set model for this, so when you are looking to fund a new DAC you can just quickly skim through, and know everything is in order.
So in the case of MediaShare(or something). It would be a document titled "MediaShares Proposal." Conceptual, we are trying to make a distributed YouTube basically. Technically, we are using Bitcoin protocol for rewards but we need things things added to pass the videos around. Financially, core developers want 10% stake plus an operating budget of 10 BTC, and we probably need 1 CEO, 2 Designers, 4 Programmers.
Community members would say 10% is too much you get 5% with an operating budget of 5 BTC. Everyone settles on 7% and 7 BTC. And then the funding period begins.
The cool part is everything would be open source, so investors can see up to the minute updates and people can even pitch in if there is a problem that needs to be addressed