The whole "success" things is a beaten dead horse from upthread.
You can find me predicting that PF2E will not end up having the same marketplace presence as PF1E. I believe they could have (yep, that is an assumption) and I certainly think they had a built in fanbase that could have made PF2E bigger and more sustained than what we will ultimately see.
Just look at the Fantasy Grounds update. Prior to the March boom PF2E was not showing any growth. And in March PF1E actually increased by more than PF2E. For a game more than 6 months established, that isn't a good sign.
There isn't any data to suggest that PF2E is catching on or growing.