The short story is, there will be transition pains, since we are avoiding the centralized behemoth which is traditional DNS.
At the start, decentralized DNS will only appeal to the website owners who like the theory or who need the concrete benefits (mostly "bad" sites like thepiratebay.se). There can be proxies set up via traditional DNS, so you can promote your site under someone else's domain to help bridge the gap.
The theory is sound and is better than traditional DNS. We have a slow war to fight on two fronts: User adoption from one end, traditional DNS servers on the other. There are efforts working towards both.