I expect majority of the JP content to be added over the months, but I don't think this is really the issue here. As long as the content isn't drawn out and NA catches up relatively quick while still giving new players a chance to understand the game it will be okay. In all honesty, returning players from JP are not primarily the focus for this localization. At least it doesn't feel that way, due to the lower level cap and missing content. I even feel like going back to JP sometimes. The producer of PSO2, Satoshi Sakai, even said that he will never implement range bans to "block foreign fans." I don't think there will be a fight between the two servers over the english players. Currently they serve two different PSO2 experiences, and while the returning player will find JP superior the new player doesn't know the difference.
But I think LockeKosta did nail the coffin with one key point. The severe lack of communication is appalling. I won't point fingers at who is at fault here because I don't know who is who. But one thing is for certain, JP gets weekly updates on how things are going, and constant roadmaps for content. They even just posted a roadmap this past maintenance teasing a new class and more! Meanwhile, we can't even get a PC release date or even an update to the progress of the PC release. When JP was going through their Alphas and betas (which I took part in both), we were given updates to everything they did and schedules for everything. The only schedule we have is Urgent Quests, which only alternate between the very early Emergency Quests from the early days of JP. I get that they are progressing into this stuff for new players, but seeing Chrome Dragon UQ for the hundredth time is really annoying. Oh look, Big Vardha! yawn
I regret not being able to submit a survey in time. I didn't find out about it until the day it was over and took too long to formulate my thoughts. I guess here is as good as any. If SEGA wants this game to be a success in NA like it is in JP, then communication is key. The content can be a year behind but so long as SEGA or whoever posts roadmaps with detailed updates in content then it at least puts players at ease knowing that we won't get abandoned for the 3rd time. Returning players from JP will likely just go back to JP. I don't think they even make up 10% of the current playerbase so this isn't a major issue. Most new players know JP exists but don't want the hassle it is to play it. The ones I've met are not concerned with the difference in content. But I can guarantee you they won't be playing in a few months if nothing gets added.
All the while I will continue to support NA, if only to stick it to Satoshi Sakai for saying PSO2 wasn't marketable in the west (I cannot find the interview in which he said this however). I want to see PSO2 succeed. I don't want to go through another PSOBB or PSU.