RN with pressure to come in extra for classes and fit testing and to pick up more hours, etc.
Units with Covid19 patients have greatly increased numbers of staff on per shift.
Union rules are different for every hospital, even within a "system"; or, within a "system", some hospitals may be union and some may not be.
Re: "incompetence" for unionized nurses - there is a period of several months where a nurse is not yet unionized. It's important during that time of training to flush out any problems. Preceptors, or teachers, have to be on their game. That said, nurses are people and sometimes there might be an area where their experience is lower or they need a little extra time or help so that may be given, naturally. With hundreds of applicants, though, for each job, managers can be pretty selective with who they hair and chances are very good new recruits may be highly qualified.
"Floating" is often part of accepted practice at many hospitals. There may be a short period of orientation to a particular unit in order to familiarize a nurse with the area, and measures will often be taken to make an assignment more acceptable so that the "experts" take care of the sickest for that unit and the nurse floating takes care of a more general patient, if possible. If not, nurses usually work together pretty well (at least where I am, but I have worked in places where people who are burnt out, don't.) Some hospitals have dedicated staff that "float" to areas where needed.
I talked to someone the other day who is an OR intake RN whose job was just moved to the bedside since elective surgeries are down. I'd think many hospitals would reassign nurses rather than let them go at this time, but as a pp mentioned, it probably depends a lot on census. But those are atypical times and I think that, from what I see, usual budgetary concerns are taking a back seat to safety, as it should be. Hopefully there will be some governmental help or lessening of usual fines or something to help hospitals get through this crisis.
I'd say that if nurses are laid off or are retired and want to come back, it sounds like there will be openings in various places as this thing heats up and I imagine the pay will be pretty enticing. Those positions will probably go pretty fast as people need paychecks. I read yesterday that in NY the governor ordered that any medical worker can work at any of the NY facilities (or something to that effect) to make it easier to shift staff around as needed. I think we'll be seeing more of this type of thing as things get crazier everywhere.
But one thing I've learned from "hospital" threads here over the years is that things can vary very much from place to place, even in those that are next door to eachother, but we have an awful lot of hospitals everywhere and policies run the gamut.