Hau replacing Satoshi in that group would actually be really amusing, although I feel like the Ultra Guardians probably won't even exist after Satoshi leaves the region since it seems like the Ultra Beasts have all been handled by this point.
Yep, would have been nice if they actually gave the group one big arc against Matori's group(A plot that literally went nowhere.... all the cool Team Rocket members always get ditched after one appearance. Gozu, Domino, Attila/Hun... they could literally do a Rainbow Rocket with just anime Rocket members if they wanted!). Though hopefully they give Team Rocket the main arc next saga, kill off Matori, Giovanni gets some remorse from his actions and disbands the org before getting arrested, the TRio get pardoned and are free to do whatever, and the end of Team Rocket is complete! Leaving Ash free to get replaced after winning the Galar League without anything feeling unfinished and the TRio getting a proper send off
Instead their final mission was super rushed and not really a mission at all...
Plus, there's always the chance that others are leaving Alola too. Lillie should stay for now so they can work on giving her a goal in Alola episodes instead of giving her in the very last minute, but I can see Kiawe heading off so he can have his rematch with Brock in one episode. Kiawe inspired to participate in the Indigo League due to Ash's accomplishments, and from his earlier interest. And given Soph has an interest in space, it'd be neat if they sent him off to meet Liza and Tate, it'd never happen but it'd be
awesome if Brodie showed up in that episode
And I don't see the need for them to exist anymore as a group, the whole UB crisis is over.... they're out, and SWSH isn't going to add more. I'd rather see Ranger characters like Jackie to show up and do mediocre stuff like the Golem thing