Yikes! I suspect new cycles will be non-stop, really, rather the situation of Todd with Beethoven.
I have a mere dozen, probably won't get too many more, maybe 2 or 3...
A dozen beats me, certainly.
I have, let me see:
Arrau, Bezuidenhout (but for a few volumes), 1/2 Biegel, Eschenbach, Gould, Larrocha, Pires II, Say, Uchida, and, I'm pretty sure, Wuertz. (I think I have the Mozart Brilliant box, after all...). I have all of Youn, so far, which might be my favorite. And I plan to get two specific more sets, I think.
Still, that's plenty, at 9 complete sets. (Well, Say is arriving in the next few days, I was told; that I'm looking forward to.) Pianists that I regret don't have a cycle are Pletnev and Fu Tsong.