A few days ago, I
started a poll that may be of interest to you. I was hoping to poll a larger number of people, but it kind of died down, so I might as well bring it up now.
I simply asked legacy server supporters what they would want such servers to look like... and, although there is a unified support behind the umbrella concept of "Legacy Servers", people apparently have different and contradictory ideas of what those actually are. To give a simplified analysis of the data there:
- Over 70% of respondents would want legacy servers for other popular expansions, not just vanilla, at some point in time. So if Blizzard does open up to the idea of Legacy realms, they should expect heavy demands for all the popular expansions. This, of course, would split and segregate the community a great deal more, and be an even bigger source of disconnect with future expansions, since there would be 4 or more different versions of the game running on different principles and having different themes.
- Over 70% of respondents want progressive servers (like Nostalrius also was), suggesting that players would eventually get bored with the legacy realm once it runs out of patches, about 2 years being the best lifespan for any expansion. Blizzard probably shouldn't expect most subscribers to maintain interest longer than that. As a side note, Nostalrius had one realm that was 1 year old, and another which had 6 months. They were getting close to opening AQ, so their numbers coincide to the prime of the expansion cycle.
- About 70% of respondents want "time bubble" servers to exist, meaning a legacy server for a certain expansion would never update to a future expansion, whether it is progressive or not. Of course, once people create characters on such servers, most would expect the same assurances as people playing the standard game, so support will have to continue even if they only log once every blue moon.
- Over 30% of respondents would want a sort of "wow revival", with the Vanilla legacy server eventually upgrading to BC, and then Wrath. Cataclysm would probably not be popular, but MoP might be in the future, which raises a thorny question of how that moment would be handled, should Blizzard follow this course. Technically, this would also not
truly support legacy servers, since there would no longer be a "legacy Vanilla realm" once the server is upgraded to BC. We would eventually be in the same position where a Vanilla realm doesn't exist, while Wrath fans, for example, would arbitrarily have to wait 4 years before their expansion is brought back to life.
- Only ~28% of respondents specifically want Vanilla servers.
Of course, if Blizzard was to seriously consider the idea, they'd have to pick a model and stick with it, which would certainly result in complaints, demands and disgruntled customers, even
within the very core of legacy supporters.
Edit: To add to this, there would be, of course, demands from people who only become interested in Legacy Realms once they are released, and the many questions pertaining to system implemented in the game along the way, such as the collection tabs I mentioned, transmogrification, battletag, dungeon journal, viable specs, pet battles, achievements, dwarf shamans, tauren paladins, and, ironically, even LFG and LFR, which some people might start asking for once they start playing there. After all, all these systems already exist in the game, so "it wouldn't me a big deal" to implement them to any and all legacy servers.
So, when they said it would be "a logistical nightmare".... this is probably what they meant.