IMO It's premature to look for successes at this stage (try 5 years from now), there is a lot that needs to be done in the space (namely in terms of scalability) before it can be ready for general use. Only recently the decentralized storage projects are coming into some sort of Beta (Ethereum's Swarm, Storj, Maidsafe, IPFS, etc..), distributed computing projects such as golem are just getting started, and more work is still in progress to make blockchains more practical, sharding, speed, etc..

How do you measure impact on society?

If you are just holding up a small claim of success to make your grand claim seem less silly the specifics of it don't matter a lot.

Ok! I thought you wanted to talk about it.

I do, but I'm interested in hearing about anything anybody thinks made an impact, not in arguing about what the rules are for making impact.

I think if one person was able to send money to another country without paying much of a fee, then it had an impact.