There's not really much of a legacy to mess up, gameplay wise. The original games were either poor Zelda knock offs or mediocre action games. One was a pretty alright isometric game, but they won't be making another one of those so whatever.
Certain people here will probably have a coronary if they do so, but a reboot is the only way to make this work. The mythos was a total fucking mess when they originally ended it, thanks to the lead writer leaving early and tons of sequel creep to try to do something with what she left behind