There are people who prefer to work in an office, and some who have that preference even if it puts them on a train for an hour or two a day. As long as we don't get legislation to force employers one way or another, I'd expect employees to self-select into those who like being around others all day, and those who prefer to work in a private office. It's a serendipitous solution we've been presented to all those open plan offices that a certain set hate: you can have your own private office with a view, but you'll pay for it yourself.
But shouldn't the employees that require extra subsidies (office space, commuting reimbursement, office utilities/supplies) receive the same overall compensation as those working from home with lower expense to the company? It seems to me that if being in the office is an optional preference for some, they should carry the cost of it.
Yes, that was my poorly-explained point: given that some people prefer to add the cost and time of commuting (possibly in order to rub elbows or attend happy hour), and others prefer to add the cost of a home office (possibly in order to retain focus or make lunch for the family), the costs might turn out similarly, and therefore I hope that remote working doesn't result in systematically lower salaries for those who prefer it.