The ATA is lobbying for all trucks to be governed at 65mph. Honestly, I think 65mph is fine. People go way too fast these days.. both big rigs and cars.. Just no reason for it.
The way things are headed it's basically like data speeds for cell-phones.. You may buy unlimited internet but in reality your capped by physical limitations..
I think years and years from now every trucker will be salaried except city ltl/food drivers.