I think they break even, it's just made the DRG = Burst / MNK = sustained even more distinct. While a good MNK still has the advantage over a sustained fight, the bursting for DPS-rush phases on DRG is immense.
I agree MNK got over-buffed though. The potency buffs to TS and Bootshine are fine, and the positional change to Demolish is just a small difficulty increase, but the Greased Lightning buff is a bit much. Especially considering good Monks could already sustain it in end-game content except for things like Ifrit dashes. Even in Coil, every turn except the last in certain phases is easy to keep it up. I have to wonder if the people complaining about it falling off all the time were too vocal, when GL is part of the skill / reward of playing the most complex DPS job. 27% more damage at GLIII over a long fight is some crazy stuff. It might end up balancing with the other job changes, but on paper it seems a bit much right now.