With computer modeling maybe the proving grounds will be obsolete and they would rather sell out. I would think its part of Chrysler's heritage, that's where a lot of milestone musclecars were tested and approved for production all those years ago.
You can't replace actual road testing with computer algorithms.
They have special road surfaces and hills to simulate road conditions and test suspensions. There is no way that they could do that testing on public roads, not to mention the high bank oval track. The "speed limit" in the outer lane is minimum of 80 MPH and no upper limit. You can do things on the proving grounds that you can't do on public roads.
They have a small test track at CTC, but it is not as good as the proving grounds tracks.
I don't see either the Chelsea or Phoenix proving grounds are going anywhere.
