They could do with activating speed cameras on the closed lanes to start fining/points for drivers who are ignoring lane closures.
I disagree, if anything they should abandon the way the earlier smart motorways work (look at M6 J8 to J10) where the inside lane gets closed off if traffic is light. These lanes should be open 24/7 unless of a breakdown.
This really, honestly how hard can it be to drive in the far left lane until a sign tells you that the lane is closed.
There are way to many upsides to counter any downsides. There are too many cars on the roads these days, adding extra capacity was really a critical priority.
How's that any different than when emergency vehicles have to get through traffic in city centres? I guess the luxury with motorways is that they have very wide lanes, so plenty of room for people to shuffle over.
Also if people follow the signs correctly, then the inside lane would be closed and free from cars for any emergency services to drive down.
The sequence of that event wouldn't have differed that much if it was a traditional motorway though. You'd have still had to veer across two other live lanes to land on the hard shoulder.