I think we will see decentralisation happen in many aspects of life.
Once the general public get used to safely storing and using their own personal private keys, all sorts of things become possible.
Rapid direct democracy is one of them.
Decentralization will take over the world and most of it will run under the blockchain because it will be the most secure way to do so.
Decentralized voting through the internet is inevitable. Soon we'll be voting through the internet with perfectly automated and counting system of votes.
I do agree that Bitcoin may well be the most secure method. Being the first mover is a huge advantage.
Why would an entity go to the trouble of creating their own decentralised leger and take on the cost of securing it when there is a secure, global one being maintained already?