There are groups that start out making fan films, acquire experience and a network of folks who are dedicated to the projects and then start interacting with other independent film makers...and eventually move on to projects in which they have more expansive creators' rights and control. Cawley Entertainment Company's Buck Rogers
project is interesting in that regard - they have a license, they can leverage their existing organization and skills, and the brief scene they've released online strikes me as completely professional (whether one likes or dislikes the content and approach is personal taste, IMAO).
The big entertainment companies have made several less-than-successful forays into producing original content for the Internet - I don't think the "breakthrough" property is going to come from there. The economies and accounting structures of the major studios are not a good fit.