According to the Bureau of Labor Statistics, nonfarm business labor productivity rose by over 10% over the course of 2020, despite the fact that most of us are working from home. (Source: https://www.bls.gov/news.release/pdf/prod2.pdf)
Companies that want to waste huge sums of money on offices are going to have to compete with companies that don't abuse their employees, doing the same thing for less. We're obviously not going back to how things were before.