KFC and IHOP are abbreviations most people were already using of a brand name. If you put X-Factor or X-Force on the brand most people in the general public will think it's a spinoff or worst ripoff of the actual X-Men.
Do I think more real minority mutant characters and female characters should get a push by the X Brand both in comics and on screen? Yes.
Should more female and minority creators be brought into the brand? Yes.
Will Disney ever change the name of the main team and potentially create brand confusion and risk losing millions? No never.