In a few years time there will be no universal postal service. You will be able to send a letter via special delivery costing £7 at todays prices, if you are lucky. Much, much, more and unaffordable to anywhere remote or abroad.
Managed decline is the name of the game, and when there is nothing left, the relics (together with the debt) will be handed back for the taxpayer to look after.
And ditto for every other essential monopoly service.