If you can keep them at that level, that is -- apparently there's a bug in the game with queuing up for BGs where you are sometimes accidentally transported to a graveyard when you queue. And for some twinks sitting just on the brink of leveling, that extra few points of exploration XP could ruin everything. Be careful with that, though we're sure a hotfix is incoming soon.
But nevertheless, people apparently still twinking -- while there are good numbers of people ready to leave twinking (or even the game), the majority of answers on their poll over there say that people are still going to try ruling the lower level battlegrounds. Which is about what we expected before the patch: these people live to bend the rules as far as they'll go, and a few more probably won't stop them.