This seems cool for people who want to be public. Good mass adaption option for a wallet?
Ethereum name service (https://ens.domains/) is exactly that. You can use use your .eth domain as a wallet.
Namecoin is doing something similar as well with .bit domains.
Those initiatives are good because DNS is very centralized in their central authority. Those blockchain domains would be decentralized and more resilient against coercion from powerful people.
THere are recent cases where users lost their domains. Look at this one from a few months ago. A guy who lost France.com domain to france government (he had it for more than 20 years). In a .eth or . bit domain, that would not happen, as a owing a domain would be like owing bitcoin.
https://www.cnbc.com/2018/04/30/france-seized-france-com-from-a-man-who-owned-it-for-20-years--so-hes-suing-his-country.html