Nonononono... The damage a (now) disgruntled employee can do is substantial. Once the employer decides to terminate, they would be beyond foolish to expect further work.

Many years ago I was on the wrong end of a wrongful termination. My wife had a terminal disease and I had started FEMLA requests to HR. But instead of being called in to discuss the FEMLA requests I was called in to be terminated. And an exec was in the room "observing". I was BEYOND ANGRY and I laid out every single grievance that would eventually make its way into my legal complaint and looking back I could see that exec go from bored disinterest to panicked terror as he realized HR had effed up BIG time.

At the end of my tirade I realized it was over, said "well nothing I say is going to undo your decision" and, escorted by the HR person and the exec who was now bending over backward to seem consoling and saddened by the hole rotten mess I packed up and left.

I knew the company was going to pay me a great deal of money, the exec knew the company was going to be on the hook for a great deal of money, but once the HR had said the words NOTHING could undo it. And think about it from my perspective, if the exec had said "wait, it was a mistake, we didn't mean it, get back to work" and I did, could the company really trust me and how much do you think I'd trust the company? See, that's the rub...