I have to admit, I never really thought of just taking iso away from the players. . . But I think there will be many fewer players with more iso than they can use going forward. Brilliant work!
/Sarcasm
I mean… All my new champed 5s are going to put a small dent into my reserves, but otherwise no. Maybe a direct iso to HP purchase is the way to go, but that function just doesn’t exist right now.
We wont need iso as we wont have the HP to roster characters or the CP to buy them! 
Player: Yay I’m finally post hp!
Dev1: Noooo!!! This can’t happen! They will spend less money!
Dev2: Well, we could give them more things to buy like costumes or cover art or…
Dev1: I got it! Overhaul champ rewards and remove a significant amount of hp and some iso as well.
Dev2: Don’t you think that that’s a tad harsh?
Dev1: Hmmm. Fine. Create a new token and throw a handful of those into champ rewards. Am I not merciful?
I gladly take all excess ISO. I have so many characters to level up, it’ll probably run into the millions.
Are we talking about Champ rewards here? Is that going to be significant? I mean, the Iso from champ rewards really just covers what you’d get from selling the cover, which is a tiny, tiny dribble compared to everything else.
Not going to solve my post-iso problem. I’ll still have more than 40m and nowhere to spend it.
Yes, this is basocally about the champ rewards overhaul. Farming 2*s was previously a slightly iso-negative activity (I think it was ~7k iso exchanged for for the other champ rewards). Now it costs more iso to farm any tier of character, and the farms will yield more shards and fewer hp/cp.
This won’t do much to soak away the massive iso hoards that some post-iso players have already acquired. But it will slow down the rate at which players achieve post-iso status.
It takes me forever to level up a character to 13/13 so i always have enough ISO on hand to upgrade them