ESO is just a bad idea for a game, IMO. The world doesn't need yet another generic, crappy, casual, solo-heavy pseudo MMORPG. And ES isn't something suited to MMORPG.
If you love ES games, is this what you want? A watered down version of ES jammed into a generic (or worse due to console ties) MMORPG format?
All of the best elements of ES are NOT suited to MMORPGs. Immersion? Not gonna happen. Freedom? Doesn't happen in tiny zones with linear/generic quest lines. Impact on game? Doesn't happen when thousands of people on your server are doing the same quests. And on and on.
Plus, ES is known as one of the best RPGs ever...but to clarify, it's known as a SINGLE PLAYER PVE game. Not multiplayer. Ever. Not PvP. Ever.
So how does ESO go from some of the strongest PvE in all of RPG history to being a watered down and generic MMORPG that's emphasizing....PvP? Say what!?
ESO will sell a bunch of units - because there are a lot of sheep out there. FFXIV, which is a horrible MMORPG and ultra weak game for dummies, proves that people will buy anything.
But, as with every other crappily post golden age of MMORPGs (EQ/DAoC/FFXI days - the originals), where instead of being hardcore and group-focused, the games are solo focused for casuals, ESO will fail to keep subscribers and will ultimately be a failure as an MMORPG.
Why?
Because single player games aren't worth a sub and every MMORPG worth discussing since WoW has followed the same pattern - tons of solo, tons of casual, very little and optional grouping, meager endgame at release.
And what happens is, people buy, people play 3-6 months, people bail and never come back. Because once they get thru the single player portion of the game, they are done.
Good MMORPGs are games people can and do play for years and years, and that's not a "casual" thing and usually revolves around grouping activities, and it's not something that's going to happen when the bulk of your design and content is focused on disposable single player content.
WoW did it quite well, though
That's one game. Out of many. Bliz does (or used to, I feel like D3 is pretty weak for a bliz game and that they've been running WoW into the ground for some time now) create excellent games.
And at the time WoW hit, there wasn't a lot of competition from other MMORPGs or a hyperactive web with a bazillion entertainment options - gaming and not.
IMO bliz got someone lucky because when WoW hit MMORPGs were just getting to be a mainstream idea, the interweb hadn't fully exploded (social media wasn't quite there yet, high speed internet was just getting to be the norm, there was an opening for bringing casuals into MMORPGs and even a lot of MMORPG vets of the time were looking for something new/else.
Due to lack of competition from other MMORPGs *and* the just getting rolling online gaming scene as a whole, Bliz had a lot of time to patch and ultimately xpac to fully hook their WoW players.
This is a luxury companies making MMORPGs now do not have.
Now there are more MMORPGs but even moreso, there are tons of online entertainment and gaming options. There are so many more fully online games now that are more mainstream - the minecraft, battlefields, LOLs, and tons of others, tons of co-op, tons of MP, tons of hybrids - online gaming has exploded since WoW.
The whole make an MMORPG that's almost all single player content, with optional grouping and sparse endgame options and promise to patch in stuff to keep you busy at some point in the future thing doesn't really work out so well - as pretty much every MMORPG worth discussing has found out since WoW. They all end up going F2P and can't retain clients - because - single player games aren't worth a sub and players have so many options these days that they have zero reason to stick with a game for 6 months waiting for miracle patches.