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It's been almost 15 years since the last one, it would make sense. The ability/held-item/signature move bloat has gotten pretty bad. Then you can add in all the esports features like saving replays, titles, ranked matches, all the forgotten formats, event battles, battle pass, etc. And then patch it whenever a new game comes out and/or do balance patches. Put a seperate esports team on it to make sure its handled well.
Then the main games can carry on doing whatever the fuck they want.