Why would you welcome a speed limit on the autobahn when you don't drive?!
But like I said, I do not consider it likely because it is not popular at all. And frankly, we have bigger fish to fry, both where the environment is concerned and things like traffic safety.
2. Killing 100 people also reduces CO2 emissions, doesn't make it a good idea...
Most highways in Germany already have a speed limit and setting limits for the few areas where it's not the case sounds like a good think for me as I had some quite negative experience with people going way to fast (for the amount of traffic).
But I also feel that the 130cap is a bit low, while taking over cars I would like to be able to go a bit faster. Like ~145?? or so?