This is precisely why something like this isn't a popular solution lots of people are working towards. Domains broadly speaking aren't a finite resource, but usable domains using common words definitely are. As time marches on human readable/typeable "permanent identifiers" are going to have to go away. Email address, usernames and the like are all going to get recycled, just like phone numbers are. Domains are currently recycled and most people probably think that's a good thing (assuming they think about it at all)