I’ve seen no small amount of companies clearly assert that they will be back to on-site work after the lockdown is over so I have my doubts.
However, I am pretty sure that remote in general will become more prevalent which is a huge win – including for the planet.
Hopefully the pressures on the business will finally make them see through the very shallow “he is in the office, I can look at his screen, therefore he is working” dogma – which almost never works anyway.