Based on seeing twinks in some BGs and dungeons you think that most twinks are leveling? That seems very unlikely.
I personally know a lot of twinks on the EU side and have only seen one level up (which he of course regret less than a day later). The lack of activity obviously comes from people being busy with endgame content, not from people leveling their twinks.
Twink activity has been going up pretty steadily during the past week or so.