It's no secret that I never liked either of these programs .. And I think it was a major tactical error to return to what must have been seen as old strengths (Casablanca and for that matter the SD music)Perhaps they went to D&L because of the success they had with their last D&L choreographed program (Casablanca). However, that idea now seems to be a mistake because D&L are giving the better material to the teams that actually train under them (P&C, H&D, P&O).
I don't know who's at fault, but it's always seemed a no-brainer to me, that with the world state of Ice dancing in flux, this was the time to make some sort of bold statement with your programs. The teams Rafter mentions have done that.
But not knowing what caused these decisions, I think it may be premature to think of a coaching change.
ETA: Just on a purely Canadian side note , I don't like either of G/P's programs any better, and can't feel that when they get to World's their material will be that well received , though they'll continue to be overrated at home .. so for me, it's like a doubly costly mistake for P/I.
ETA again: (sorry) W/P only got the full credit they deserved at home when they simply could no longer be denied and there still was resistance to the very end.