This will never happen and its only mentioned to keep the do-gooders happy.
Its like smoking, How easy would it be for the goverment to say no more cigarettes to be sold in shops???? It would drastically cut down the smokers.
I was part of a team fitting the windmills you see dotted around everywhere a few years ago and the project engineer told me that they will never save money and will constantly be a cost to the taxpayer but the green people feel at ease when they see them and keeps them happy.
So no need to worry this is just another gimic the goverment is sending out and they make too much money from speeders the same as cigarette smokers