Pretty sure it's more of a tactic to try and balance warehouse stock levels, manufacturing schedule, and consumer demand instead.
I was also under the impression most of last year that PC was a poor seller, along with TH. I just saw PS or GE going out the door most of the time instead. Could be many reasons for that, but it wouldn't surprise me to see PC and PS blink out together later this year the way GE and TH basically did. Lately I've seen a lot of love for this set on these forums, but still...
As the last apparent $150 modular set, with the new "midi-modulars" line, and the general chaos factor, there are plenty of reasons TLG may slap an early retirement on it. I'd start getting serious with PC now if you every plan to (and for my money, it ranks well above PS, maybe even GE).