i'd probably play it if i had more time.
Back when i played classic i had lots of free time, could play 8hrs a day easily and things still took ages, i'd been in wailing caverns or BrD runs that took 3-5hrs (maybe that was tbc). these days i can play like 2 hours a day at most, it would take me far too long to actually do anything, and i wouldn't even get the fun of discovering new things :\
I think current WoW is a bit too fast, but i just don't have time for the slowness of classic. Granted, it would probably be faster than it was due to people being good at the game now compared to back then, but still most likely too slow.
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I remember in TBC when i first discovered questhelper(name?) addon, that changed the game for me, made it so much better. When classic releases, there will be an addon for this i guarantee.