I'll copy my comment from another thread:

Imagine if they made a deal with Larian to make another installment in the franchise (not Fallout 5, just something like New Vegas by Obsidian). How cool would that be? They specialize in turn-based, top-down RPGs and would fit perfectly.

I know Larian also takes time to polish their games but if they started now and Bethesda some time after, then we would have two very distinct Fallout games with possibly not too much break between them.