ANet, the meta event rush and boss rush were both brilliant ideas.
There's only one problem: they took people away from other areas, but didn't really help the population of ALL maps with metas or bosses.
I recommend doing many more meta/boss rush events, but focus them. Focus the rushes on specific regions or zones.
One week, HoT meta rush. Next week, PoF bounty rush. Third week, LW Season X rush. Etc.
There are tons of possibilities. If this were done, and there was some kind of schedule (like with dailies), it would help people complete metas and bosses needed for certain pieces of loot and achievements.
NOTE: For a revenue increase: You could also create a gizmo that pops you to whatever rush is going on at the time, similar to the world boss portal device.