The problem with CRZ is that it provides a large number of low level toons in quest hubs that its worth while for high level griefers to camp. Before CRZ no high level would stay in Marshal's Refuge Ung'oro just in case a lost lowbie will show up. Now there probably are 10-20 low lvl chars of the opposite faction. I dont mind the quest competition or world pvp when engaged by similar level chars, but when a high lvl just comes and stomps you .. that is unpleasant.
Yesterday I got to Area 52 with my lvl 67 shadow priest .. there were 3 lvl 90 alliance killing everyone. Instead of getting the quests I just did 3 dungeons and I'm 68 ready for wotlk and whatever awaits there. So basically instead of making people get back to the world, you are encouraged to spam dungeons.
But I doubt they will remove CRZ, because it's a solution for them to use less hardware to host all zones on every server even though there is no one there. Before you had 50 Silithus areas on 50 servers for maybe 30 people ..now you can have just one. Maybe downscaling people to the level of the zone as done in GW2 would solve some issues. Then at least 2-3 lowbies can kill a downscaled
lvl 90.
In the end its just a necessary evil on your way to level 90. You just got to suck it up and do it.