Bots will likely benefit from WOW TBC Gold the boost, which makes it more difficult for bots. If bots were controlled and the boost was controlled, it would not be an issue. My family and I go back to classic because we enjoy the tbc. They join only because they have the ability to increase their levels beyond the vanilla levelling content.
Our characters are already in Classic. They don't want to sit inactive while others visit TBC. Every character will have their names copied prior to the launch. TBC will change the "active bit" on the TBC database to true, and the Classic bit to cheap Burning Crusade Classic Gold false if you select TBC. Then, you can pay $35 to get the Classic bit reversed.