I know it is hip to make statements like "Rooney wouldn't get into a PL first XI" and such, but I think in terms of actual end product, Barkley is not any better.
Sure he always looks busy and about to do something useful but he is literally pointless in most games. Koeman has not been shy to state this over and over.
He is still young obviously and could get better while the only way for Rooney is down but it won't hurt him to rotate at #10. With Gueye and Schneiderlin behind him, Lukaku ahead of him, and Bolasie + 1 either side of him, there is plenty of energy and runners around Rooney. He would still be quite productive in terms of assists.
Everton fans I've talked to would take him and I personally think he would do well there. Not world class performances but industrious and productive enough to justify a starting spot in most games (probably dropped for a 3 man mid against top 6 opposition).