That's why there are usually progressive disciplinary steps. I've been on the receiving end of that in a couple of situations (which I'll admit after the faact, were due to my own issues). It's not pleasant but it was necessary, because I wasn't going to give up trying, but I was in no shape to actually succeed. Better to cut the cord - I wound up in better situations after each occasion, mostly because I wasn't bailing water anymore and had energy to do well.