Unfortunately, nothing can be done about that atm. Maybe if enough people hit 70, we can get a decent amount of bg's going during EU prime time, at least that's what I'm hoping for. But that won't be happening for a few weeks/month at least, since most people take their time on 1x leveling.
Arena will never be a thing here, because you will be constantly hitting the same team/s, and if they are your counter or a tough match, won't last for long. Also, there are people already geared in quite a few T5 pieces, if they decide to go double trouble dps team, pretty much newbies with no PvE gear won't stand a chance. Not much point talking about PvP gear since due to the lack of bg's popping up (unable to get marks), there won't be any for a long time and world pvp gives miserable honor.