How will employers convince staff that commuting and office attendance is better than working from home?

Depends on the nature of the work. Collaborative work is often easier to do in-person, but for more independent types of work, some workers find that they are actually more effective if they mostly work from home. This can be especially true for people who face a long commute every day, since working from home means they can put more of their most focused energy into actual work rather than wasting it driving an hour or more each day.

by making the office fun so theyd want to work there

Probably through a continued weekly pay check.

Install a fridge,sofa and tv set in the office.