The thing is, the majority of motorway drivers are doing MUCH more than 10 miles. Even if only doing 100 miles that's an extra 45mins on the journey!
If it carries on like this and they keep slowing us down and fining us on motorways, there will be little advantage to using them. People will start to use the A and B roads again, bringing the traffic and pollution back into the towns and villages that motorways were meant to bypass.
I'm starting to do it already. I've noticed that when planning routes on google maps, journey times using motorways aren't much quicker anymore, and if staying off the motorway only costs me 10-15mins on a long journey, I'll use the A and B roads. They're much more fun to drive, and I can't think of anything more boring than sitting at 50mph on an empty motorway. Its more dangerous too - as people are more likely to fall asleep at the wheel, or be tempted to use phones, play with infotainment systems etc....