Your NIN will still need TP in A2S. Honestly, having a NIN Goad me in A2 wouldn't really reduce the amount of Paeon I play. If anything it would just mean that I use more Quick Nock with the additional resources being made available to me.
I'm curious about the damage output of BRDs that aren't playing any Paeon in A2. I would almost say that it is probably impossible to be pressing your GCDs without very significant delays in A2S if you never run out of TP with no regen.