The biggest problem I foresee is that the NA players who never played JP server or wants to do any research will get left behind significantly, also at the same time I don't see that much point to waste huge amounts of meseta and resources until EP6 when you literally have everything better, but people want the 'best' stuff now to show off I guess.

The upgrade paths ahead are fairly complicated if I'm being honest, and if you want some of the best gear then its going to cost you a fortune, and unfortunately this is why I see people hacking.