Training people, both workers and management, how to work in such environments. Plus for many companies expanding the bandwidth and security for their entry points for the corporate network. This can include locking down connected equipment to block high data volume sites and activities; you cannot believe the number of people who try to stream across their vpn connection.

Not everyone wants to be remote, where I work they asked for volunteers for the first wave and had to turn people down for some groups. For these the separation of work and home is line they don't like to cross.