Hmmm. Interesting read. I've temporarily quit driving recently because I was fed up of the high price of fuel and the nutters who I was sharing the road with. My Road Tax and MOT were also due when I quit so I figured I wouldn't spend the money on that right then, quit driving for a while, walk to work, get my fitness levels back up, etc., etc., etc., but I digress...
I think increasing the limit to 80mph is a bad idea unless they get rid of the 10%/10%+2 rule. I used to drive a lot on the motorway when visiting my brother and I almost always stuck between 55-65 for fuel economy. Not to mention that I used to drive a pick-up truck so aerodynamics is a little poor. I can, however, make it up to 90 without much issue but people would still try to bomb past me. It's like they see a pick-up so it
must be driving slow. I've had little Ford Kas, Peugeot 106s and Nissan Micras almost fall apart as they rattled past me at that speed.
It's actually scary when it happens because you can visibly see that they have almost no control or grip at that speed.
Maybe if people can learn better on-road manners (e.g. staying in the slow lane unless overtaking) and judgement skills (like not trying to go faster than they can think, let alone faster than their car can reasonably handle) then we could abolish the speed limit but, for now, I think increasing it would be just plain stupid.