The players who would like to finish maximum but don't have the resources

The players who would like to finish maximum but don't have the resources to do so yet with tbc modifications or stay in classical. They can join new guilds, and then begin raiding nax starting from scratch by creating a new raid. They'll have to WOW TBC Classic Gold pay for a cloning service or a an account new to play the game. Because the original wow community is no longer around and the cloning process ought to be cost-free.

The servers that are currently in use will change to TBC servers. The new Vanilla versions of those servers will open up. You have the option of activating the character on the TBC server or the Vanilla version. You'll need to pay to activate the same character on both.

EDIT: This post was sourced from Blizz. On Patch day, you'll be able to access the Battle.net desktop and select the game you would like to play: WoW Classic or Burning Crusade Classic. Both types of games will display your current characters with the old name/s of the realm. When you have chosen a game, select a character you'd like to play and then confirm. If you decide you'd like to play your character in both types of games it is possible to make use of an optional service to access the cloned characters in both games. All you need to do is sign in your account as normal and play.

Yes, as the copy is made prior to release. Classic includes all characters, therefore there is no copy delay if you select Classic. TBC could cause downtime, just because it is not instantaneous. It can cause more characters being copied simultaneously. This could result in the system going down.

Bots will likely make use of the boost, which makes it more difficult for bots. But if bots were removed I'm not sure the boost would pose any problem. My friends and I all go back to classic because we love the tbc. They only join because buy WOW Classic TBC Gold they have the ability to increase their levels beyond vanilla levelling content.