I don't see how they plan on keeping any sort of stable price with this inflation.
This decision makes sense if Doge intends to stay the "great comment, I give you 10000 doge for that" fun-currency and drive out everybody whose primary intention is financial gain.
Why have a whole system that accomplishes no more than merely typing the words did? Stick with the words. Easier, faster, just as much fun.
Easier? Yes. Faster? Yes. Just as much fun? I don't know. Psychologically a Doge has still more perceived worth than than karma. At least to me.