The fact that Pokemon Red/Blue/Yellow sold 46.01 million units worldwide is the all-time best selling game.
But, I think Pokemon will end up like Street Fighter II. I mean Street Fighter II was as popular as Pokemon. You could see people playing Street Fighter II at every arcade center as you could see Pokemon everywhere.
Over the years, Street Fighter II introduced the super moves and tag-team battles.
After that, there were basically no more unique features done in the game which led a downfall of the Street Fighter series.
If the Pokemon creators don't think of something intriguing and unique, the chances are Pokemon will fall.
I hope this won't happen because I am a big Pokemon fan.