Actually, I'm far more likely to accept if I think I'll be fired tomorrow on a whim. Like, I can accept 3 months severance today -or- take a six-figure bonus today and then get 3 months severance tomorrow? That's the easiest money I will ever make.
You're assuming that your'e still getting/keeping that bonus after being fired. There's no way they are just giving you 6 figures in cash and hoping that you'll stick around - it's golden handcuffs.
And as others mentioned, the recent batch of firing "for cause" did not come with the same generous severance.