I agree, it's an interesting choice of interviewees. Still, this change is probably going to be mostly academic to them. Most geezers here, I've noticed, stick to their 65mph, tops.
I've been living in Arizona since 1993, and there seem to be 3 distinct groups out on the interstates. There's the 55-65mph group, the speed-limiters (75mph), and the 85mph+ group. While I'm for this change, I don't think it's going to have a large impact. We're only talking about 5mph, after all.