Some concerns... solo players having more of a impact on campaign? When I played live, and when i've played this, the game was built around guilds, 6 man's at the minimum but usually warbands (Guild, Alliance or Pug)
The best impact a solo person can already do, well a good soloer can already take a BO, can take supply, can scout enemy movements that is pretty big impact for just one guy if they are co-ordinated.
At the moment we have had some 6 man's (that complain about zerg but have no problem ganking 6 vs 1 outside warcamps like a boss over and over) most of them(not all) have zero impact on the campaign because they don't play it to win, they play it to farm solo pugs only. I think 6 man's at the moment if they have the right mentality and attitude can impact the campaign quite alot, but i've seen how salty and misguided some of these pro's are for trying to flame bigger guilds that actually play the campaign and have a impact on pushing it forward.
I think a problem with the server is the fragmentation, on both realms... with so many small guilds without any real leadership (by that I mean active making events and leading warbands like Ocara/GDY do most the time on destro) these small guilds rely on pug herders way too much, realm heros who have to deal with alot of salt to make something half functional for little reward.
Bigger stronger guilds, or bigger stronger alliances make for a healthier competitive game IMO. Or atleast more active pug herders on both sides.
My next concern is fight avoidance... this is a very real thing, it happens more than I like... I know it happens to my guild and I know it happens to Phalanx, if we hit a zone (it doesnt even have to be full warband or optimal setup) we always see people from the other side log off, switch to t3 (to pvdoor empty zones) or switch sides to destro, or change raid days. I know fight avoidance is hard for you guys to control as overlords because it is player mentality and people are always look for the easiest path (path of least resistance sad but true in game based on fighting)... with multiple active zones I think this problem will become worse and we will have to go hunting even more (which im fine with btw even if it becomes more logistical issues... time and money wasted respecing)
With spreading the action across tiers, and the recent dip in activity in T4 (was healthier 2 months ago, less dead zones, many warbands to kill in eu primetime) I don't think it would be a good combination. I know its summer, I know with some changes and if patcher/dungeons get implemented that should bring back some players to check out atleast whenever that happens.
Server activity, we need more player made events (like T3 last night was fun because bitterstone said they was going to be there, other people was naturally there, CNTK went there... I brought a few guys there and lead a little too)