While never a transit activist, I would be in favor of dense, walkable cities regardless of work-from-home. I think these are more healthy in a multitude of ways.
If people can live in low population density areas while eliminating 90% of the miles driven per year, that's considered a bad thing because it doesn't support the urban vision they have that can only work if alternatives aren't allowed to exist.
Can you really eliminate 90% of miles driven by doing work-from-home in an entirely car oriented place? I live in small city surrounded by rural areas. Plenty of people have to drive five mile or more to get to anything. If someone did out once every ten days, it would unhealthy in other ways even if it conserved fuel, imo.