I will be cancelling my card in January, the renewal is in February. I just called up to use my free night in December and got my hotel of choice, so that's good. I also have been receiving half fees for the last few years, but even with that it's no longer worth holding.
The PP is losing value too as many restaurants in the airports are leaving (for example, the PF Changs at LAX has left) and their lounges are truly average. (well any that I have used, anyway.) We are normally in J on long haul though so use the J lounge.
I will keep it until the end of the year and the lovely concierge also said that he would email through a list of the benefits that I haven't yet used for the year.