This is kind of the article's point though, because there are other federated/decentralized efforts going on outside of blockchains that do solve problems now. Having the potential to solve problems possibly in the future isn't that special, lots of things have the potential to solve problems eventually.
The questions are:
- how long will it take to solve those problems?
- how much effort will it be?
- how likely is it to succeed?
- are there other efforts that are more promising?
- what are the costs/downsides associated?
- etc...
And when you start asking those practical questions about the real world, and not just thinking about "maybe this will be great someday", then cryptocurrencies start to look a lot less attractive.