My end goal is for this to congeal into something like an open-allocation environment, but one that exists across companies to some extent. I feel like if we bring OA to the external market, we'll force the hands of employers who will have to improve conditions if they want to compete for talent. So, the trans-corporate open allocation (because each person carries an income that follows her whereever she goes) is the ultimate end goal. That may be completely insane, but isn't that what the open-source gift economy is-- trans-corporate collaboration?
Getting designers, marketers and domain experts will be hard. I grant you that. Strong designers and marketers I can spot; domain expertise I would not be able to tell, unless I had it myself and, of course, for most domains I won't. I think that to get a domain expert, you'd have to hire her into a company already formed through this process, because you're right that there's no way we can build up a competent selection process for every domain we might care about.