What you say here might hold water if there was only one cryptocoin. The fact is there are hundreds and there will be thousands upon thousands of them in the coming years. Decentralization comes from every one having an easy way to create their own money/token and embed usefulness in it, to work to make it valuable. Some will succeed in this endeavor, most will fail, it doesn't matter. Decentralization is in breaking monopoly of state on creation of money and having everyone and their mother create some sort of loyalty points with value that others are willing to work for. This will be the end of state monopoly on money, this is what decentralization is about.