Whilst we have not seen a Legends Unova game on the Switch, we should still see one at some point on Nintendo's next system. Of course one does seem guaranteed, such as the fact that there's a dragon type legendary fro before it got split, along with unanswered questions about Unova that can be answered by showing off the region's past. Sure not every region should have it's past shown in a Legends game, only ones that are worth it should have such, and Unova is one of those regions that could definitely use one at some point. Plus at some point in the same gen, there should of course also be games that has Modern Unova being explored in some capacity.