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It's because people have been playing MMORPGs like they are single player games for the last 6 years. MMORPGs cannot offer the same experience of SPRPGS because the world cannot be focused around every single person.
MMORPGs have one major advantage over single player RPGs that make up the difference for some of us, and that is the ability to play with friends and meet new people. The more and more developers get away from MMOs strong point (social) and focus on their weak point (RPG), the more and more people are going to leave the MMORPG community.
I love Skyrim for what it is, a single player RPG. It excels at what its supposed to.
Now we just need an MMORPG to follow suit.