Tbh I feel that all these different leagues will be the death of TF2, not the death of ESEA. The worst thing we can do right now is fracture the community between two leagues, hopefully people are gonna realize that the state of this game rests solely on bringing in new players. With multiple options like UGC, RGL, and now NACL this could potentially put up more barriers to new players than bring them in.
I could be very wrong (probably am) but I don't see multiple leagues functioning as separate entities as a good thing, its gonna lead to siphoning from eachother and eventually kill off one, or both leagues.
Also, how would to invite divisions work? How could NA have one official champion with two leagues? Just doesn't seem right.