You launching one game and within that game you have base (vanila) and access to TBC and WOTLK which is like WOTLK works now, you can go back to TBC and Vanilla areas.
However
When you enter TBC, Vanilla or WOTLK area you will automatically load that character profile and all patches associated with it. So for example as a 72 mage when you enter Classic you will load lvl 60 profile of that character, with gear, gold, items and evertyhing else you earned there; exact same way like Classic vanilla works now.
This way we keep whole community in one place who can enjoy entire game the way they like doing things they like without need of launching different games.
And to all of you saying about some tech limitations to that or servers; we got 2023 for christ sake. Everything can be done.
No need for that. Just incorporate character profiles in the game. Again its 2023 not 2006. Something along the lines of character selection screen where you load different char profile.
Again I’m not tech guy but there are solutions there.
Yes, the solution is here and it is called Classic Era and Wrath of the Lich King Classic clients. Adding TBC Era would negatively impact both abovementioned versions playerbases and not even last as long as Classic Era does.