With the increase in merged realms, and the consistent over-population in some zones, I personally, in my own opinion, think it is time to remove CRZ. Cross realm Zones were a bandaid for a much bigger issue. Now that the issue is being addressed via realm mergers, there is no longer a need to be crossed with realms outside of our own merger.
The rubberband effect when crossing the lines is ridiculous. Trying to chase someone down for revenge is near impossible if they end up in a different CRZ. Going back to grab that rare you spotted as you flew over on a flight path is seldom, if ever, possible.
It's time to rip off the bandaid and let the freshly merged servers heal. Just my 2 cents.