The goal should be to have 3 good centers. Strength down the middle is of the utmost importance; center is the most important position on each line.
When the Flyers won the Cup, they had Clarke-MacLeish-Lonsberry down the middle. In 03/04, they had Primeau, Roenick, Handzus. In 07/08, they had Carter, Richards, Briere.
Sometimes I feel like fans are happy to settle with average or "good enough." If you want to be a really good team, you should want outstanding depth down the middle. Backstrom-Kuznetsov. Crosby-Malkin. Matthews-Tavares. Bergeron-Krajci. Those are just a few of the combinations you are up against in the East.
Patrick as a 2C just doesn't cut it at this point in his career. Now, adding a good 2C in Hayes and having Patrick as a 3C with upside? Much deeper, better team, and much less pressure on Patrick.