4 strikes today with current speed enforcement is fine; 4 strikes in a hypothetical where 100% of infractions are caught, I aver will catch (almost) everyone who actually drives within a month.
Perfect enforcement has to come with immediate feedback
You may be amused/horrified to know that the UK police managed to send me a speeding ticket letter for a car I'd sold 6 months before the offence.
I only owned the car for a week, to sell on behalf of my partner who had moved abroad.