Of course you can't plan ahead for stupidity and inconsideration in the future, but that just means that of all the people on my road, I'm not contributing to the problem, I chose to get rid of some of my front lawn to change from a tandem driveway (of two cars) to one that now can fit five (we have three). I modified the drive BEFORE buying a third (and at one point fourth) car, I didn't buy one and then dump it on the pavement because "not my problem".
Yes, because having adult kids living with you and getting a car or new neighbours moving in with the same number of cars as others is 'stupid and inconsiderate'

. And I'm not sure why you thing 'not my problem' is what people think when they find somewhere to park on-street. 'not my problem' seems to be what you are thinking with your 'I'm alright jack' attitude, without any consideration of what a practical or desirable future looks like for UK households in general.
I hate to say it, but you are basically the parody I had in my head of the type of person that would be in favour of this ban. You obviously strongly feel that on street parking is already wrong in some way (despite it being allowed and practised by millions for decades) and that people that do it deserve to be punished in some way. You have a particularly large property if you have space for five cars plus some of your front lawn remains.
A small minority of houses have as much space as yours does and they tend to cost quite a lot, as I'm sure you're aware. The UK housing stock (let alone the homeowners having to find huge amounts of money to move to a house with more land) simply could not support any large scale move to reduce on street parking in favour of driveways - only a small minority is able to do what you have done.
If everyone planned ahead this wouldn't be as widespread an issue, and for those who haven't planned ahead that's going to be their issue if/when an enforced step-change in parking comes into play. Do I care that it'll inconvenience the people down my street whom park all over the pavement with multiple cars? Not even the smallest of amounts.
Perhaps people did 'plan ahead' and decided they would be fine, on the basis that partial pavement parking is generally accepted and allowed outside London, and there is no good reason for it to be banned. I can assure you that I did plan ahead with regards to parking on all of the houses I've rented / bought (including houses with 0, 1, and 2 spaces), and using on street parking was part of my consideration each time.
As it happens I currently have driveway space for both my car and my partner's car. If I'd have wanted space for visitors as well then I'd have had to compromise massively on basically every other aspect of the house. And why? So I could follow your made up rules that apparently everyone should be following already.