I don't think it is possible to sue in these cases, due to Crown Immunity.
What would be unprecended would be a removal of pilot privileges.
AFAIK this has never been done before, on any scale, in any civilised country. Yet this is what EASA is proposing. I wonder whether they are unaware of the ***t that will hit the fan? There will be a lot of it because the vast majority of pilots, particularly working pilots, are totally unaware of EASA's proposals.
My take on this whole thing is based wholly on Yes Minister principles (EASA is nothing to do with aviation and everything to do with job creation, job protection, and politics of envy) and suggests that EASA is adopting a hard line because they have to (not many people down there on less than 100k p.a.) and they will run with it till the last moment (they have to because they have left themselves no ladder to climb down with dignity) and then a deal will be done (and a suitable person/party will be blamed).