I think they need to make the rewards for completing leves more compelling, by adding in SP bonus's for completing the leve.

Say for dunesfolk you get 10,000 sp for completing the leve, and perhaps more if it is linked, abanding the leve means you walk away from that bonus.

Sure people might still fail the leve, but gil isn't so much a trade off. Perhaps they can add additional bonus to the mix, but the real issue is people use leves for SP, that is the real reward, so hopefully SE will introduce new ways to get SP, or new ways to reward players for compelting leves. Perhaps give players the ability to get more leves, or have more leves open for selection rather then just three per camp per reset.