I have no doubt people will forget in time (<5 years).
But anyone looking for a job ought to do due dilligence when things pick up again and at least set the correct expectations about how long their relationship with the company could last if the market turns bad again.
Why? If anyone frequented this or many other forums they'd know employers can terminate employee any time without any reason whatsoever. Leave the job with as little notice as possible because employers absolutely do not care for you. And when last year it did happen people here are feeling hurt as if forever job promise is broken.
"As little notice as possible" as in send an email 3am Wednesday that you have left the job and as of sending this email you are no longer able to be contacted? I would have a very negative opinion of that person, just as I do of the employer who conducted layoffs that way.