DH - congratulation on all the work you put into the question re. earth's inertia and the very biblical 'fall of a leaf'
Needless to say, this is immeasurably small.
Off onto another topic, perhaps you can direct me to a site for explanation or in a few quick illustration clear up my understanding.....
Black holes - some with masses measured in multiples of the mass of the sun, will eventually disappear from losses due to Hawking's radiation. Yet as far as I can see Hawking's radiation must be rather tiny - half the mass of a particle/anti-particle. This, it seems to me, would qualify under your rubric of 'immeasurably small'.
In this context, will the earth stop rotation before one of these super massive black holes fades away?