The other thing to consider is that the television series could share resources with the films. Million dollar sets, effects, etc. can just be redressed and repurposed. It's been a standard in Hollywood for decades (i.e. Universal Studios Sliders episode "Slidecage" using, at no cost, the main set built for the cancelled Universal Studios Timecop series).
With films in constant production (I believe the word was one every three years), the television series could look like a blockbuster at a fraction of the cost. That's something Licas didn't have when he was trying to get the tv series going; Lucas wasn't making Star Wars films then and didn't want to make Star Wars films.