There are a few facts that may affect any throwback MMO that may be happening in the future.
1. PC gaming reached its peak of funding and large scale releases around 2007-2008. Large publishers were dumping a ton of funding into PC gaming including a bunch on MMOs.
2. No Big publisher today is funding these types of games right now.
3. PC gaming is showing significant growth over the last few years and continues as a growth market and investments are happening again ( not 2007-2008 levels )
4. CRPGs have been revisited and are successful: Divinity, Pillars of Eternity, Baldurs expansion, wasteland
5. CRPGs had a huge influence on old school MMOs as we have played them.
It will be something indie that happens that is eq-ish and personally i think its a matter of the tools being good enough to make a truly good MMO that will bring the old school back.. There will have to be several of these old school, kickstarter or otherwise funded games to get the big publishers back in the old school MMO game.
It will take a while, but it will happen.
Or maybe Blizzard just starts up its own Vanilla servers..
Blizzard Execs ( including C levels ) met with the group that built nostalrius in June.