Quoted from o-din:P2K didn't help. Players I knew including myself thought they were a novelty at best even though they got decent coin drop, and a few of the last real games being released like Cactus Canyon were lackluster at best, with bare bones code and bugs that were not being addressed or updated so players were not wasting money on them and sticking with older games that they knew worked.
I find myself in the startling position of being in disagreement with you on this one, which may be a first for me. We operate an arcade in our soft serve ice cream restaurant which is very busy during the summer season. We typically have run around 10 or so pins at a time and I can tell you there has never been a title in that room that has made more than the 2 PB2K machines. And honestly the worst thought of title (STE1) out earns everything else. And we have had some A list stuff pass through, games that are worth triple on the collector market and they still don't compare to the coin drop on STE1.
Personally I think if WMS had stuck around to make more titles it could have been a game-changer for pinball. We will never know now.