I'm pretty surprised Sword Art Online isn't even an MMO. We got video games already but you play as Kirito in them. FFS just give us a fully fledged mmo.
The Aincrad version could have a built in permadeath system like Diablo 3 in which your character gets deleted after he/she perishes (if the player doesn't want this there could be servers that don't have the permadeath system). And while ranged weaponry and magic is mostly omitted, the combat could be fully fledged out with dodges, combos, counters and so on. A combat system thats a cross between Vindictus and Dark Souls would be welcome. Throughout the game you could progress through each of the 100 floors, in which in order to reach the next one you need to finish off each floor's final boss.
An mmo version of SAO would work really well. It could even have the same graphics as the other SAO games like Hollow Fragment. But nope, we instead get a bunch of mediocre tie in games where you play as Gary Stu kun and have the option to bone any of his harem. Bullshit!