I noticed you have some kind of disdain towards RuneScape...a smart developer would actually look closely at their unique system, as they're one of the most popular long-running MMORPGs still in service. The average MMORPG lifespan is only about 2 years. That's another major problem with doing an MMORPG...do you have enough content planned to keep people drawn in for extended periods of time?
Oh, I almost forgot...if your MMORPG is combat-centered, it's already boring. PLEASE don't make yet another "go kill 10 mobs for items quest" type of MMORPG, they are SO ultra-boring.
Okay, I'll stop playing devil's advocate now.