25% to 40% of Tech workers could lose jobs due to vaccine requirements

I'm posting this here as this topic deserves to be thought through from a logistical point of view.

Putting all politics aside... what happens when 25% to 40% of SysAdmins, Devs, etc. are all fired or furloughed between now and December?

What impact does that have on products, companies, and the industry as a whole?