We routinely see people championing the expansions because many of the ideas that Classic came up with were developed and explored later on, and various issues with classic were resolved during the first two expansions (I.E: making sure that every settlement has a forge and anvil).
Further, it is far safer and easier to re-release the first two expansions (I would prefer all be released myself) with a modest transfer fee to move to the new servers( if you don’t want to build a character from scratch) then to try and build new content for a version of the game that is 13 years out of date and that will inevitably anger segments of the base no matter what content they have.