I'm not disappointed. If anything it means I'll get to play it more because my boyfriend and I only have one Switch between us llol
As for the Kanto stuff...
It would be more how the characters have aged over 20 years - clearly people like Misty etc wouldn't stay in the same position (some might) so you'd see what they're doing, see how the region has been changed since your original visit (new structures, areas), see how the Pokemon have changed and help Lillie find the answer. It would honestly be really cool to follow a new sort of journey. You wouldn't even be YOU, you'd be a new protagonist (visiting from another region) and you would play as that and find Lillie, and follow along her journey, and then from an outside of game POV, discover how the region has changed. So like what B2W2 did for BW, after two years. This would be after 20 years so just think of how many changes are possible!
But yeah, that's ideally why Kanto remakes would have made sense especially with the movie coming it. Nobody wants the same old Kanto, it's more they want to see how it is now, after this long sorta thing. I'd love to see that for every region honestly. No more remakes, just long-awaited sequels.