In terms of the way that the term reboot is defined in terms of serialized fiction, you would be discarding the entirety of the existing franchise, and, again, FOX had the chance to do so with First Class and opted not to.
And again, that's not what I'm talking about.
"Reboot" has many definitions these days. Frankly, the word gets thrown around so much that I feel it has lost all meaning. I'm saying get rid of the entire continuity. I'm saying they could use the time travel aspect of DOFP to change or undo certain things that they don't like so that they can ignore them with future movies. What better way to ignore The Last Stand
than by using the story to undo it?