Tanks holding fights hostage in Roulettes

[Fhaerron]

There are many ways SE could address it if they thought it was a that much of a problem.
An extremely simple solution would just be to have the bosses occasionally apply a doom debuff on the tanks that has to be esuna'd by a healer. You don't see this happening on the first boss of Dun Scaith for a reason.

That would result in a lot of wipes because a lot of DF healers don't know what Esuna is.
But who can blame them really, unless you do EX/Savage you don't really have to use it.