That is the most important question which all these ICOs and tokens can't answer. If they can't be used for anything useful or provide very value that means their price is just a bubble led by naive investors and speculators/scammers.
I once saw a hilarious answer to the question about unique uses of blockchain as a general concept. One user said that it is great for "tracking of diamonds". O.M.G. People expect other to pay money and invest time in development of a tool to enable even more closed-in and tightly controlled global monopoly by De Beers mafia cartel :)