PoE2 bombing all but guaranteed no PoE3 I think.
Roguey will probably know
POE2's had a good afterlife though, so far as I can tell - it's a huge, highly polished CRPG that's just sitting there, and lots of people have gotten round to trying it and have found they like it. Every now and then one of the YT channels has a review saying, "Hey, this is actually very good."
That will count for something, I'm sure. It seems to me that it bombed because the people who'd invested their hopes in POE and made it a success had been disappointed by POE and so didn't buy into POE2. If the marketing had been different (not marketing to people who'd bought into POE, but rather to a wider audience) it could have been much more successful.
Case in point: I've played through it 2 and a bit times, and I've really enjoyed it, but I hadn't bought it at the time of release (I was barely even aware of its existence), but long after, on a bored whim.