A 8 episode run of Star Wars every 3 years would do MAJOR MAJOR numbers.
Give it a budget around $100 million and they'd make 10x that through DVD sales, not sure why don't seem to realize that.
Because a movie in which they gross over a billion and continue to make money off of dvd sales worldwide, and then money from tv rights, would make much more money than a high budget tv show. The hype surrounding a blockbuster movie can't be duplicated with a tv show, they just won't gross the same amounts of money.
As popular as game of thrones is, they really don't have more than a few million viewers every week and it doesn't make that much money.