While X6 has problems in gameplay and lore, I really like what it does with its tone and atmosphere.I meant more so as a frame of reference. X8 is better than X6 and X7, but it was pretty clear that X5 was the final game in the timeline. Inafune even reccomend starting from X-X5, and the immeditealy jump to the Mega Man Zero series.
I rented MML back in the day. Decent time. I never got around to Tron Bonne nor Legends 2. Anything is possible at this point, but I have feeling the next game will be another OG series game.
I think part of the problem with making new games in eras outside of OG is how time constrained they are. OG has that formulaic Saturday cartoon aspect that makes it easy to slot in new titles without messing anything up.
I would say ZX is the best place for a new game outside the original series. While I would love a new Legends game, I think they need to rebuild goodwill before they touch the controversy around the cancelled 3.