They've been making them for forty years, and bags (and even most components) from a Henry made in 1982 work fine in one from 2022. I don't see why a product that's built its brand on reliability and sticking to what works for four decades could be any more less likely to go out of production - especially as it's been a consistent top seller in its domestic market for most of that forty years.

And generic bags work fine, they're not proprietary. You can even get cleanable ones if you want to fuck up your drains.