I'm not sure what my opinion is, but do think that if we could enforce rules on middle lane hoggers, we could effectively gain another lane by using all existing road space. During many parts of the day, lane 1 is virtually empty while lanes 2 and 3 are full! Get people to only use those lanes when overtaking and you've suddenly achieved something without ANY clever technology or monitoring.
After all, when we now have 4 lanes with the hard shoulder, won't we see people still driving in lane 2 (now 3) making it illegal to undertake and leaving huge sections of road empty? I only need to think about the wide stretch of M25 near Heathrow to see how bad things can be because of poor lane discipline.
You've gone off-topic, but it gives me a chance to bleat about a pet hate. UK lane discipline, or complete lack of.
My personal conclusion won't be popular and many could predict it - it's about speed limits. Drive in France, Belgium, Germany etc - which have a more relaxed approach to speed, and lane discipline is excellent. That's because if you are sat in the outside lane at 65mph, you'll have a Mercedes Sprinter Van grafted to your back bumper. You'll often see drivers flashing their lights and the slower car obediantly moving over. Consequently, drivers always move back to the inside lane and everything goes like clockwork. It's a pleasure to drive on the continent (except Holland, who have similar issues to the UK and funnily enough, are sensitive about speeding).
Here in the UK, the 70mph limit is higher up the priority list. Therefore, it strikes me that people think if they are doing this speed, they can be where they like as no-one can go faster. Except the guy behind wants to to 80mph and he won't move because surely that's faster than the car behind, and so on. It'll never happen; but if you upped the limit beyond what many are comforatable at driving with, lane discipline would improve. Yes, there'd need to be an amnesty in Sprinter's who would spend the first few months doing us a service of 'educating' slower drivers at some risk - but hey!

Slam.