Taking this to its (il)logical conclusion
The yard should be scrapped as it is based on the length of Henry VIII's arm, and that arm has now withered away;
the mile because it is 1000 double paces of a Roman Legionnaire, and there aren't too many of those marching around;
and the metre was originally based on 1/10,000,000th the distance from the pole to equator, and we all know the Earth is not a sphere so that is not a standard distance.
The point is, many units are (or were) based on things that are no longer available/accurate/realistic, so a new basis of measurement is agreed, e.g. the wavelength of light at a particular frequency, or a bar of Invar in a laboratory, and we carry on as usual - this "issue" is much ado about nothing.
(Of course frequency is based on time being constant, whereas time can be bent, so nothing is 100% accurate.)
btw, good to see MfM firing on all cylinders - straight to the point as usual.