Solar System "Wilderness"?

The latest debate on environmentalism: "How much of the solar system should be designated wilderness?"

The article lays out one position:

Martin Elvis at the Harvard Smithsonian Center for Astrophysics and Tony Milligan at Kings College London. They have studied the nature of exponential growth and say that our limited ability to predict its impact means we should take this into account when limiting how the solar system can be exploited.

They calculate that humans should be allowed to exploit an eighth of the solar system, with the rest designated as wilderness. And they warn that at current rates of growth, this limit could be reached within 400 years.

OTOH, I'm pretty much ok with utilizing the resources of any uninhabited lifeless regions for the benefit of humanity.