It is not realistic to assume that they add this content. The only stuff I could imagine is maybe Transmog or Dual spec, maybe dungeon finder. But whole new zones, dungeons or even raids, is a no go I am afraid.
Classic Vanilla is played by a few thousand people tops, there is just no community for the investment it would take.
While I think that TBC fresh would have been the way to go (the only time fresh made sense in my opinion), the lack of players is not because TBC is out, but because classic Vanilla just isnt as popular anymore.
Yes, there is a tight community that plays it, my realm has a nice community of a few hundred people and its fun, but we are in a minority and this will not change with a fresh realm. People played through classic once or twice by now, why do it a third time?
Those that want fresh are min maxers, powergamers or streamers who want to fill their ego with realm first but after that? They will leave immediately and the realm will remain empty.
I saw this happen at classic with new realms, also at TBC and Blizzard will have learned from that I hope.
Only realms made on release are still healthy on retail, all other realms are dead there and only saved by xrealm and dungeon browser. Same will happen to Vanilla fresh, it just doesnt make sense right now.
It would be much more important to add important quality of life features, like the name system. I have a friend who wanted to join me, but her name is taken by someone who doesnt even play. She would have joined, but not without that name that she had since Alpha WOW.
Some others dont want to play as they want dual spec, dungeon browsers or transmog, some even 1.5 AV and so on. These are things that could motivate some to play on classic vanilla again, but if those things will come? Who knows.
The right click happens everywhere, but I agree xrealm is a mistake and that is why I dont understand why you want server merges. The are evil and kill communities, not fix them.
If you want a realm without strangers, RP is the way to go and it is heaven. Just that we share BG´s, with others is an issue.
I dont know why you feel people were forced into TBC, as they were not. I am still on classic with my chars and made new ones on TBC. Nobody had to go anywhere, but truth is, the realms were already quite empty before TBC realms came up.
Most people realized at one point that layering and xrealm but also the whole 1.12 balance are just not as much fun as playing WOW 1.0. Besides that, the rose tinted googles have worn off, a lot is just painful like killing 100 strider for 8 claws and such.
For many classic vanilla was a short fun when it was new, but after a while only the try hards were left and BG´s were full of twinks and rank 14 premades, which was terrible and finding a raid without paying gold or competing with the lotus mafia became a chore.
Honestly, I understand why many did not stay and leave.
People can already do that. We have reroll projects on my realm, two nice guilds with active players. No need to fracture the already small community even further by opening new realms.