Make one day? It already has been done multiple times. Just look at ultima online. And it has been done in similar ways in eve online(you have to smash the enemy first, to get their stuff).
Yes, we already HAD good MMOs with tons of interesting features(Housing, Thieving, Crafting where you actually feel like you crafted something, PvP with Purpose, Player generated Content, and so on). Then came wow and told everybody: "this features are not neccessary to have fun. All you need is combat and good balance". BLEH! And that was it. In fact every new mmo is only easier but in no way better than the old mmos. Even WoW Cataclysm is going in this direction. Compared to wow classic this is just a lame copy for the dumbest possible player. I've seen not a SINGLE MMO since EvE Online(Character Development) or Vanguard(Diplomacy) that offered something really new.
You're right, actually

I guess I hope someone will do it
again, and better as well. I think EVE is probably closest right now, but it's just not my cup of tea. The old SWG was a good example, until they "wowified" it...
The "problem" with MMO's is that any company able to invest enough to make a AAA title, wants to have huge subscription numbers. To get these, they will try to make a game that offends the least amount of players. So there has to be balance. Everyone should have acces to everything. Etc. etc., we all know the WoW-formula I guess. Now I'm not saying this is necessarily a bad type of game, I enjoyed a few for quite a while. And even though
I am done with it, lots of people stil enjoy these games.
It just puzzles me that no company seems to think "hey, the WoW-like market is cutthroat competition and loads of games fail, but there are quite a few MMO gamers who want something different... maybe there's money there!?".
I must admit, though, that I haven't really been keeping up with all the new MMO's lately... I hear Darkfall mentioned often when "sandbox" is brought up, and they have a 14 day trial, I might give that a go.