Hopefully we get a new Etrian Odyssey for Switch (and I don't care if PS4 and XB1 get one too, the more gamers can play it the better I guess). Not sure if this is a teaser for next-gen EO, but I would certainly be happy.
The question how to solve the map-dilemma is certainly interesting. The Lost Child allows you to switch the view of the map, including overlaying it to the general view:
That could work. I still hope you can put symbols and notes onto that map, that is something which certainly is part of EO.
For presentation, I must say Octopath has shown a way, to transform 2D images into something new. I think Atlus could look at that for inspiration for a new EO. But I would be fine with the classic view in higher resolution as well. Yeah, I would be fine with that:
And I certainly hope it still keeps the turn-based battle system. But as it is from Atlus, I don't think we need to worry about that.