Depending on your job function and industry. For tech, yes, those days are over for at least for another 5 to 10 years, is my guess. COVID has generally proven to both employers and employees that productivity doesn't drop that much. It will also weed out bad people managers who need to "see" people physically who need to "get a feel" as a management metric.
The only major factor that would swing the pendulum back into offices, is when future diseases get under control much more quickly - whether that's corona virus or the next version of it, H1N1, avian flu, MERS, covid-19, etc. When the population is smart enough to win those battles quickly, and that there's a company where in-person teams outperform remote teams by a large margin, that's when in-person will be back and the pendulum swing again.