There absolutely should be an opt out.
Let players that enjoy being ganked 24/7, never seeing rare mobs, and getting nasty lag spikes have their way. Let the sane players have an escape for that nonsense.
Had the same problem, took care I got 60 in dungeons, moved to Zangarmarsh, never been ganked once and actually had fun WPvP among equally leveled players.
Same for Hyjal, forgot all about it because it's full with Dbags on all the choke points. Moved to Vazj'hir, again had meaningful PvP, no ganking (2 players jumping you doesn't make it ganking btw if they're equal level) and the end of the zone was people free mostly.
Look CRZ has it downsides atm, but measures could be taken to improve it. To me it's indeed a problem of how the rules of PvP are and not so much CRZ itself.
The L90 jumping on low levels really should stop IMO. It's not fun and it makes for very crappy gameplay. PvP implies there's a battle of some sort even if not entirely balanced. Ganking is not a battle, it's an execution. Since CRZ I have had fun WPvP once more, but it's only if you can at least have a shot at defending yourself. Then you can actually feel the exhilaration while with ganking there is nothing but frustration. Again, it's bad gameplay no matter how you cut it and the last people you should provide for is people who take enjoyment out of killing defenseless people just for the sake of ruining the experience for someone else.
Yes, there should be one.
CRZ players will never see any difference if they added an Opt-out option - as CRZ itself mathematically brings players together up to a certain point... so they will get to play with people who WANT to have CRZ. (example: If a CRZ zone merges people into one zone, so if 100 people opt-out, CRZ's system will automatically fill in that 100 player deficit with 100 other players.)
Everybody wins if CRZ had an opt-out function.
I think it would defeat the point of crz if there was an opt out. If you don't want to deal with what a pvp server is, don't roll on one.
Do people like this still seriously believe it's ONLY insane PVP players complaining about CRZ?
CRZ is hated for a LOT more reasons than those doinks who chose to role on a PVP server but couldn't hack getting ganked - and you damn well know that. If you want the other reasons, look over the several months of pages of threads with your eyes open this time to see them.
"World if alive, Great!"
Why? Most of my complaints boil down to that one question: why the hell should I care if there are 0 people in the zone with me, or 50? No content while leveling requires more than 1 player, and most is actually more difficult or more annoying with more, so why is this "great"?