I really love first generation, and it's my favourite. But I'm not a purist.
I think any new generation won't make us dreaming as the first one did, because it was the very beginning of Pokémon. We all feel this awesome nostalgia when thinking of it. But that doesn't prevent us from liking the other generations !
Ok, for me first Pokémons were badass, that's for sure, but, there has been a lot of improvement since RBY, about the plot, the towns, so we can't say that 1st gen is the best of the best, just because it's the first. That doesn't mean that we can't prefer it, but let's be a little objective.
Pokémon ultra purists are too much stubborn.