Not as of yet. They're quite active and do their job, as expected. Demoting staff could turn out to be a difficult experience in the long run. Hope I never have to resort to going down this route in the future. 😛
I have demoted a few people but all but one of them were because of a resignation so I would not totally call it a "demotion". The one I demoted was inactive so I simply said "goodbye" and I don't think they ever read my message despite them logging back in. 😛