That idea has merit.  It depends on the classes in your group, and the healer, of course, but if you can convince your group to treat it like a Darkweaver Syth fight of sorts, you could probably pull it off.  I'm not sure which would work better, spreading the debuff out, or stacking it on one person so the healer only has to focus two people.  Being a mage, I've never tried it that way.

It seems like it should work though.  You just want to make sure everyone understands.