Removing LNC skills will kill the job. Think about it.

If BRD loses invigorate, the only way they can get TP up is paeon. BRD burns through tp at a moderate pace on its own, but once you start throwing in Rain of Death it burns through it substantially faster. Add in AoE spam and there's no question that they burn through their TP faster than any other job in the game.

BRD will end up having to rely on paeon to keep their TP up, which means no requiem and no ballad. The only way to get ballad as well is to add another BRD to the group and have one ballad and the other paeon so both can be kept up for a long duration of time. But the problem is they get -20% dmg debuff the entire time. Add that to the fact that they'll lose BfB, and you have a severely gimped DPS class taking up 2 slots in your party, and we all know how great the majority of people are with DPS checks in this game already. Why even bother taking BRD anymore? DRG and MNK are getting buffed, which already do higher DPS than BRD. It would kill the job completely or at the very best turn it into the job that nobody wants to play but someone has to if healer MP becomes an issue in a fight.