A significant portion of "Classic" players would like #nochanges. Classic+ would not be Classic and would appeal to players who aren't "vanilla or WOW TBC Gold vanilla" players. Modern MMO players would want modern-day designs while old-vanilla players would want basic design and it is best to have "no modifications" since they're not good at the game...
Many players have switched to FF14 or New World so now they want more or simply switched games. Classic+ must be as dumb as Classic to be able to accommodate "bad" players (LFR) while offering modern encounters for everyone else... It's a challenge to achieve, if it ever occurs. It is unlikely that the Classic+ community would come together cheap WOW Classic TBC Gold in a single unit because of the fragmentation.