In the same interviews where Obsidian people said PoE2 had surpassed 1 million in sales, they also said they broke even on PoE2 financially. So the game may have been a financial disappointment, but by no means was it a financial failure, even though that word--failure--gets thrown around liberally by people in forums like this one. And Obsidian has also said they have not closed the door to a PoE3 in the future, saying they see a potential market for it but their devs are a bit burned out on PoE and need to go work on other projects for a bit before returning to that IP.
Yeah, I'm pretty sure you already know that they won't go back to the PoE series until they're sure they figured out why PoE2 wildly performed below everyone's expectations. For now they've pivoted over to Avowed, the first person game taking place in the Pillars universe.
Still though, this many cRPGs selling more than 1-2+ million would have been unheard of before PoE and DOS1 entered the picture a little over 5 years ago, after the void that the BG series left in its wake. Unless you count the Dragon Age series.
