I suspect the same fate awaits the Bomber Command Memorial
You may be right, but the Harris memorial was specifically targeted because of who he was (ie it wasn't random vandalism). I wonder, therefore, if the vandals may make a distinction between the instigator of the carpet bombing policy (who should have been aware that it wasn't working) and those who bravely carried out the orders. Far from guaranteed, I grant you (and there's always the risk from random vandalism, but here's hoping!