Hoenn and Sinnoh were written with the idea of having powerful starters, and those just happen to be the times where Satoshi didn't own any water starters. Honestly, the only change to the starter trio I want to see is Tsutarja evolving into Janovy. They've been around for so long that I just want a single evolution for the sake of change. I don't really care about any specific Pokémon reaching its final form.