From the Clone Wars Trailer thread, many of us came to the conclusion that Lucas was making Star Wars TV in part due to the merchandising.
Hasbro made a deal with Lucas for extending merchandising rights until 2018. Many of the figures and vehicles today are made from the old O.G. molds from the 70s & 80s.
Last Christmas, I posted in the Collecting forum how Star Wars figures and vehicles were flying off shelves, despite the end of the movies and Star Wars fatigue. With the 2008 Prequel-Era Animation and hopefully 2009 Original Trilogy-Era Live-Action Series, Hasbro doesn't even have to make new molds, just sell re-paints and re-packs. Although Hasbro is a making a few new molds for stuff.
With that said, I think 4 to 5 Live-Action television series maybe a bit much. What's interesting is that McCallum is already floating a "main character" for potential spin-off solo series. Stuff needs to start leaking because it is apparent there is stuff to leak.