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Its easy. And I suggested this before GW2 was released because I already knew what was going to happen from past MMO experiences. I got a lot of hate for it. Turns out, I was right and it would have solved the problem
Low level and mid level zones being absolutely dead, and everyone being at the high end of the game.
Guild Wars 1 had this problem too once you got out of the starter area.
HOWEVER...GW1 let you hire henchman and companions. This let you still experience the storyline and do dungeons, that you couldn't find a group at all (rarely) to do.
Why did they remove henchman and companions? It would have solved the problem of people not being able to do their PERSONAL story. It would also have solved the problem of people having to skip entire content because there is no one around to help them do the dynamic events or anything.
GW1 did it, and it worked really well. If I couldn't find a group, I would get henchman and I could still progress through the game. Easy fix.