I really doubt that.
For all its faults, Pokémon has the aesthetic and collection down to a T. It's cute and it's fun to collect monsters. Then on top of that in terms of video games (and card/table top games), they were the first to do it and therefore have a massive mindshare.
Perhaps one day something really good (that mainly looks good and cute - so no Digimon) will emerge as an alternative combined with a collapse in the popularity of Pokémon. I can't see that happening any time soon though.