For most people I suspect they come out on top even with the extra expense of needing a decent internet connection and some office space. Commuting (particularly into London, which is what I'm most familiar with) is expensive - I'm a 1.5 hour train ride out from London, and an annual season ticket costs £6,000-£7,000 per year, depending on the route and whether I want a travelcard for London as well.
There's a subset of people who can normally walk or bike to their office and are now faced with either moving into a larger apartment or renting a co-working space--which I don't expect to be typically reimbursed. But most people commuting in from or around the suburbs can probably make the space at home work and are saving double-digit dollars per day.
Maybe, although I’m currently being paid top end London wages in the country. A lot will depend on supply and demand, what salaries people are willing to accept, and what more openness to remote employees does to the candidate pool.
