Uh...he's ultra competitive?
Of course he is, that still doesn't mean he can't go into a short lull when the team is decimated by injuries, when the Coach is not very good at manufacturing better matchups etc etc... It looked like for a short period of time he was just sick of it, and it seemed to affect his play. He will still produce points, he'll still play hard, he'll still try harder than anyone to win, but even with Sidney Crosby you could see that a small edge was missing from his game.
Purely speculation as to why of course, he could have had an illness, another compressed schedule due to the Olympics, maybe this was the time he takes a short "playing break" to stay charged for an entire season as it's got to be extremely tough on the body and mind to play like he does for so long,or maybe he's just looking ahead to Christmas lol. I don't think it lasts long, because he is such a competitive person with immense self motivation and with external factors to help that motivation as well.
I voted YES, as I don't think he can play at a much higher level than the last couple of years, but I don't think a decline is anywhere close to imminent.