Personally I wish, with advancing tech, we could reserve memorable words or phrases as well as numbers. I have strong verbal memory and poor numerical memory. I realise we can 'save' numbers on our phones, and so the cool idea of kind of owning a domain-style phone word is rendered unnecessary, but I'd love my kids to be able to key in 'OurCatJemima' (who no-one else knows was called Jemima) and press 'call'. Or a customer to be granted access to a memorable verbal password, key it in, and get put through to me. I don't see why we need to be limited to numbers. I guess because numbers is the system we have, it's simple, and it works.
I've often day-dreamed about how domain names (or a similar registry system) could be developed for wider use in other walks of life. (And of course, in the day dream, suddenly domain values go up significantly - I bet I'm not the only person who's day-dreamed that.) Probably the risk from advancing tech is in the other direction, with DNS getting superceded by a different access system
I have a number that includes 007 which really helps someone with a weak numerical memory like me, but rather like the 123 mentioned above, on its own I wouldn't think that has much value.