The pokemon fandom suffers a lot from the Zelda cycle (though I think, given another gen or two, it may start being called the pokemon cycle instead...). People love the current generation, and the one a few generations back. We're far enough removed from RSE that we have this super rosy nostalgia glow around it, and we're clamoring for remakes. I nuzlocked Ruby and Emerald last year, and I can honestly say that while they were fun games, they're no more or less fun than any other game in the series. Kanto and Johto also have had enough time between instalments (and remakes, yikes) that we have a similar nostalgic glow. Everyone loves Kalos at the moment because it's the next big thing, but I predict that in a generation's time, the lack of a postgame is going to seriously hurt our opinion of it. Gen IV is currently in the "loathed" category, though you can bet that once we get RSE remakes, everyone is going to be saying how much they loved Sinnoh and want to see that one remade. And Unova is in a tricky place because people are pretty divided over it right now. Some people like you, and me, loved the whole fresh start approach and the droves of new pokemon, plus the region's aesthetics, a good storyline and music, etc. Others... I dunno, I guess right now people have latched onto the idea that introducing 150 new pokemon was a bad thing.