This may be somewhat of a suggestion, but I think it should be for general discussion for now.
Before I start, I do not want the next paragraph to sound like a big complaint about all the good efforts the staff are doing right now on MoP, it is more of a comment on the realm being released too soon and illustrates the subsequent suggestion for general discussion.
The big problem with MoP is it has been available for quite some time and we are no where near anywhere close to having the content that makes MoP different from previous expansions added yet. In theory a player could play all character types up to level 90 on MoP, get all BiS gear on all those characters, play for 2 more years, get bored, leave for a couple of years, then come back and still the MoP content will not be done yet. For example, they haven't release even 1 scenario and no mention of tillers farming etc. Its ok not to have everything done prior to open, but things that set MoP apart from previous expansions are things we'd like to see, or it would be better to wait until they are available. Think of Blizzard trying to sell the new expansions, players read the new things on the expansion box then get excited and buy the expansion to see those new things.
Now for the suggestion. WoD has a bunch of features that makes it unique from previous patches, the list may be an old one but you get the idea:
1.) Garrisons
2.) 7 new PvE zones, one world PvP
3.) 7 new dungeons, 2 new raids
4.) New scenarios, world bosses and challenge modes.
My suggestion is that it remains in testing and not open as a regular zone until at least Garrisons and the new scenarios/world bosses, and a good number of the new raids are working. Yes I understand progression and such but in private server some do not care about progression, they just want to try all the new content before they are old and grey. This way after it is publically opened staff can focus on the rest of the WoD dungeons in a timely fasion and whatever class bugs need to be done and can fill in the cracks with broken quests and older content.
I sort of wished I waited 5 more years until the unique content and old dungeons were installed to try MoP and don't want to have the same experience on WoD. This is for discussion, the player community can weigh in their opinions so staff can decide this in the future.