Maybe this idea has been presented already.
Immunity tokens!! 5g, 10g or whatever, grants the user immunity to all attacks (like a pally bubble) for 5 minutes, with a 30 min CD. The buff breaks when you engage in combat with another player or mob, when you zone through an instance portal, mine a node, etc. I think 5 min is enough time to get from a FP to a raid entrance but short enough so you have to hustle.
Comments and concerns? Just an idea to help get a great game be great again