Unpopular opinion probably, but creators should be allowed to stop creating more stories inside a particular world. It's like the issue we had with TV shows just getting the chewing gum treatment. Some worlds should have an end. Though maybe there can be spin-offs in this case, stories unrelated to the current cast in any way.
They haven't said they intend to stop making D&D games. And every D&D crpg in the last 20-odd years (since Torment, I think) has been set in the Forgotten Realms. So it seems highly likely that future games will be loosely related to BG, just without that specific title.
I would love to see them bring back some of the weird old settings, like Dark Sun, Spelljammer, or even Dragonlance. But I'm not holding my breath.