Ummm I vaguely remember the quote, though don’t remember where from. However I doubt this very much will actually happen. Currently battle is the only real reliable way to get traitstones. Leaving it purely to a random chance in Maps would be horrendous with the traitstone farm as it currently is. Yes there might be some for PVP Ranked, but as other’s have mentioned else where, these will likely only be picked up bit the highest of high level players.
TL;DR I doubt it will happen without some other LARGE change as well. Not for 2.0 for sure.
EDIT: Just to clarify, I remember someone saying that the devs said that, I don’t remember that the devs themselves saying that.
I don’t ever remember a dev saying they are getting rid of stones dropping after battles. O.o Why would they do that with everyone complaining daily about not having enough stones especially arcanes.