For me, mostly just a major inconvenience. For some, probably a reason to not bother with instances at all anymore since there's no happy friendly buffer just buffing everyone to make their life easier in dungeons. I know I definitely won't be waiting around for some great team or an unlikely buffer/healer to show up to do dungeons at the intended level. I'mma just keep leveling and ignore that crap. Dungeons don't drop lots of stones anymore, and with buffs constantly being disabled I can't run in-and-out fast enough to really consider myself "powerleveling".
Almost no-one's a buffer. We're gonna start running into the issue now that people will only use lvl70s for every dungeon, like they how need a healer for every CC/BID run. Is it really worth it??
If you're gonna stick with the update, at LEAST make it so it only affects Ultimate/Chef buffs and not my own dragonbuffs and such. I only ever use Dragonbuffs for dungeons, don't take that away from me. >.>