The workers that are not laid off mostly will be contract or part time in the new job.

Quite, these 'workers' can try make themselves useful in the real world.Who really cares what happens to the so called tech workers? Go Elon
and bring a light lunch and 2 pair of gloves......wait...they're gonna expect to be able to work from home..I've got work for a few of them. They'll probably need to get some different shoes.
Ironically, when you treat employees like Musk just did, the good ones are the ones that leave. They have opportunities elsewhere. Pretty much every large company has openings for software engineers and developers, and they aren't going to be making those kinds of demands of their employees.Elon is playing a very dangerous game. I understand his reasoning for wanting only the best Type-A tech personnel-programmers at Twitter for 60 to 80 hours a week to institute his new ideas quickly....but there is a work/life balance...especially around the holidays, end of year. I'm going to enjoy watching what happens...success or failure...either one, doesn't matter to me. I imagine if he succeeds it will due to the fact his personality, direction and motivation brought others on-board...if he alienates people his company might be one of his biggest money-drain follies.
In my opinion, Elon is playing it (twitter clean-up) like an aggressive-motivated 32 year old would, demanding more hours, no consideration to on-boarding (carrying the sink drain pic)....I think he'd be better off playing it as a 52 year old...a bit more sensitive to the human factors, showing them clearly the new direction, on-boarding firmly while offering them a piece of the dollar pie in extra bonuses if the new twitter vision materializes.
All the laid off tech workers and one's that walked (from any company)...if they are worth a damn...there will be a lot more new innovation, new start-ups happening. If they were just relaxing and coasting...working just enough to get by...those tech workers will be unemployed for a longer time and will suffer the brunt of being laid off or walking out the door (with regrets).
They're getting a severance package from Twitter, but people who quit aren't eligible for government benefits.Do people that quit get unemployment?