Over the summer it did create a high floor - $169pp was the highest I remember seeing taken back so you are interpreting the graph correctly. A number of people (myself included) bought PVB early (before
DVC sales started) to get the existing member benefits and booking window but the price was definitely inflated and demand was high. (I think at one point there were only 11 PVB contracts on the market - am I remembering that correctly?).
I don't think that floor has dropped as much as it will when dues start getting added this winter. If you are not in a time crunch to buy it could be worth a decent chunk of money to wait and watch the market for at least a couple of months.