Well, considering that all (well, some of) the content that we already have in the game was originally introduced by GSE, and we have it in the MMO because all the subsequent titles continued to have it (I'm talking about features, not plot, though the plot is pretty much the same in all of these games), it's not really surprising. But here's a question: what makes you so sure that I won't care for the 2h30m story of GSE? How is it any worse than the one in B1W1 for instance? What's the point of playing the MMO if I can just emulate any of the games in the first place?
Me, I hate mmos in general (most online games, in fact), because I hate seeing a crowd of people standing around locations doing nothing; or wearing outrageous outfits and other cosmetic items that only they have access to because they grinded their character to the top level, or paid a ton of real money to buy said cosmetic items; or doing the same quests while circlejerking a quest-giver npc. If it's what these players enjoy, more power to them, I'm just saying it's immersion breaking. The only real advantage any online game has over any singleplayer game is that you can play with other people, though that's a questionable advantage if you don't like people, or if can't find someone to play with (for any reason), or if you're not a competitive online player. I mean, people sometimes challenge me to battles, but they always seem to have pokemon some 20 levels higher than mine, so why would I want to battle them? No offence to anyone on here, but to tell the truth, I only play the MMO because it lets me have my own character instead of the standard characters in the original games, and because it connects several games under one roof, the latter being just convenient.
And what are these dungeons anyway? How do they fit in with the original games, or the lore (if lore is in any way important to the MMO players here)? I mean, nothing wrong with having dungeons, but content goes both ways, and you're not bursting anyone's bubble.
But whatever, I get it, you hate GSE/ Johto, you don't want the devs to add it because you want other kind of content, and you want it now. Nothing wrong with that, just no need to jump at people's throats, "bursting their bubbles".