But most people don't know that there are massive tax benefits to working from home (at least in Canada) you can write off the percentage of your house you work in of your rent and stuff like that. That alone can equal a $1000 a year or so.
But from a company point of view, getting rid of the office is a massive save in money, so I suspect some will increase salaries or offer other perks such as skipthedishes accounts or what not. Most will just pocket it though.