Light should absolutely be a right. In jurisdictions around the globe, they have 'right to natural light' easements etc., and potential by-laws to protect and promote natural light on certain areas. Take the city's stance on shadows that are cast on public parks and spaces - while not a residential tower, you can see that people are concerned with the access to natural light. I have lived in places where the spaces are so tight there is no light access at all and it makes for a pretty bitter and dark existence.
Aside from the debate of whether or not it is a privilege to live downtown or not (it shouldn't be), the concept that natural light is a right would behoove designers and builders to come up with more innovative approaches to getting natural light into buildings.
p5