Let's face it. Everything in this world is about making money. The sooner you wake up from the dreamworld that making games is all about love and passion the better.
Big corporations are very unlikely to risk launching a new IP that might not sell when they could just as well release an other sequel to an already established franchise that will guarantee them sales for the same production costs.
It works that way in any entertainment related industry. Change, difference and "NEW" stuff always comes with fear.