Technically The Moon is slowly leaving earth's orbit too, to the tune of 38mm per year[0]. Everything's temporary...
Goodbye Moon would be a great name for a children’s book focused on space and time!
the way I remember that fact is it is also average fingernail growth per year
That's like calling a lifetime lived within just one village 'temporary'. On the scale of human events it's nearly as permanent as anything else for which we commonly ascribe permanence and reliability within lifetime scales.