Really? people are still not playing 20+ year old games and paying for them EQ \ Runescape sure a few others, most people I know quit playing a game when it's no longer fun, how old it is does not have anything to do with it.
what other reason do you have for them leaving (sure a few time\money\life) but the wow forums are full of people asking for the original old LK game instead of going to go play it for "free" elsewhere.
**to take a page from Ion's book, if the Dev's are soooo great and can do no wrong why don't you go play retail and stay there with all their great design ideas an let the people that wanted the 2008 design have the 2008 design....