I agree that Pokemon doesn't really have anything going for it beyond the Pokemon themselves, but I don't think a hypothetical no new Pokemon generation will really fix any of the other flaws of the series. It would just be a Sun&Moon quality game, with a new setting and hopefully better graphics.Might be an unpopular opinion, but I think why Pokemon fails to advance gameplay at a rate of most other videogames is because it relies far too much on the Pokemon themselves. If we remove the Pokemon, what exactly does the game have going for it? Story? Pokemon's story has always taken a back seat, and SwSh has done nothing to change it. Battles? Battles are held back in-game by the lack of intelligence in the AI, and no difficulty settings does nothing to address it. Multiplayer is the only way to get a full feel of complex battles. Characters ( Human Characters ) ? With the exception of BW and SM, characters don't get enough time to be fleshed out, with SwSh's Marnie and Bede having development off screen. And don't get me started on programming, Models, and Animations, which are reused from XY for more than half a decade, with only minor adjustments to the splash effects.
Difficulty: The philosophy these games have had since virtually the beginning of time has been "make the games hard if you want to", leaving the baseline difficulty pretty trivial, with any spikes being easily fixed by grinding and/or simply bringing the correct type advantage. And they have to be brute force beatable by the starters lol. So I don't think more development time will suddenly change this deeply ingrained philosophy.
Story: This is a more solid idea of what could be improved, and I guess more time would hopefully lead to be a more fleshed-out story (given I don't think they'll ever go any deeper on a story beyond "friendship triumphs and damn why is the 10 yr old such a good trainer").
Animations: Yeah these would be better, altho it's a non-factor in terms of actual gameplay and it's really only a sore point because of Dexit. Given I don't think the models themselves are bad in the slightest, in fact they're so high-poly it's borderline detrimental.
I really think more development time for a more polished product is the most we can reasonably wish for, because I really can't see Pokemon (already hugely successful) suddenly becoming a super nuanced fantasy epic RPG, it's just not the identity it has established over the years and there's also no incentive for them to alter this identity.