Q: Why doesn't the Postal Service use pointers?
Would it not make sense to 'virtualize' mailing addresses, such that they no longer map directly to a physical address, but to a database entry containing one? So that a change of address is a simple process of updating a single record and is completely opaque to mail senders?
(And now I'll just get back to the massive undertaking of updating my contact info with all the different vendors and institutions I conduct business with.)