Well... becase they came out 20 and 30 years ago, ofcourse they are pretty dead in sales, that makes sense no? most those who play or played them already have them. POE is the only *new RPG* with a style close to classic Rpgies and it did pretty well. So Its obviously not dead and there are still people who would like to play RPG games and not dumbed down games.
I dont think anyone one can really call themselves RPG gamer without playing at least POE.

And ofcuorse things need to change and you need to get on with the age, but that doese not mean making a souless AAA game. There is a balance needed between classic and new, otherwise, the new is forgettable.