Shits been around since
Neocron. Which I played version 1.0 of yo... Definately not revolutionary. I'm pretty sure I was playing it before 2002. It got re-released several times. Had a tough tough start, like 200 subs for a hyped up game from a small but not cheap studio. Played a bit in the beta-1.0 and payed for my accounts. Played a bit once they relaunched it. The world was really cool though. Just didn't play well at all.
ESO might be fun. But their balance and leveling formula is still shit and not immersive in Skyrim, though leaps and bounds better than Morrowind and Oblivion.
However I play TES games for lore/giggly quests. Not hack'n'slash.
If they make it work in an MMOFPS. I will be VERY impressed and call it revolutionary. Even if its not original.