Crowdfunding is not inherently limited in scale. If it can raise $5k $50k or $500k, there's no reason to think it couldn't raise $5M. Or even $350M for that matter. The reason these projects aren't being funded is because they're basically uneconomic to make in the first place; by forcing people to pay for content instead of releasing it for free (effectively a price floor!) the proprietary market has to compete by "gold-plating" the stuff and wasting away any potential gains in efficiency.

Compare U.S. airlines before deregulation got rid of the price floors there. Incredibly appealing service, with great waiting areas at the airport, gourmet meals in-flight, young attractive air-hostesses, and so on and so forth - but only if you could afford it in the first place! Behind all that luxury, we were actually seeing rampant wastage of resources.