As AFKers still are a thing, and a cashout option seems to be too hard to put in, here's a suggestion for the specific case of people AFK-ing, waiting for participation to decay (and that don't know one can go to OS).
Talking to an NPC or in the WvW UI would allow a player to put himself under an on the go status. That status would have the following properties :
The core idea is you can't do anything WvW-wise, so you stop counting in the map population, but you still can stay at spawn, do whatever stuff with bank or NPC's and get your rewards. A possibility would be to turn characters "on the go" into Mist Walkers (like in Southsun survival).
Any opinions ?
Look at that—you broke Scruffy's sarcasm meters. ~ Taimi.