The other 2 options is a form of economic limitation accounting for 48%. I would be VERY surprised if any of those "Yes! Wipe it all" would change their vote to "No! Don’t touch my gold" if that voting option was removed.
I'm sure people would quit, but you're making it out to be some extravagant number when you have no evidence. It's more than just that too - I know of people who won't play TBC if there isn't an economic limitation or fresh servers, myself included. It goes both ways.
My ideal world is have fresh servers and leave the classic -> TBC servers alone. I think this is what Blizzard will likely do. If they don't do fresh servers, then they missing a large target of their audience I think.