I think people are overstating the impact of playing with better linemates.
Even if they upgrade on Connolly at some point, a prototypical elite playmaking centre might help Phil reach the 40 goal mark, sure, but it will also hurt his assist totals as he will be the goto goal scorer at that point.
So I wouldn't be shocked to see 40-25, or even 40-30 at some point.
But come on, Phil Kessel - a point per game player? Not a chance. Mark my words.