Rooney would easily get into our XI often enough. And, though he isn't the freak he once was, he's still a damn good player who still loves this club after all that's gone on. There's a role for him here, and I have a suspicion that he wants to do good by Everton.
Like StevO said, a front three of Rooney, Lukaku and Barkley would be terrifying. They're all skilled, all offer something different and are all capable of the spectacular. And, having three major threats up there allows for them to move around and create some major mismatches against defenses.