Reader Bob highlighted on a Marginal Revolution post: 

My favorite unpopular blockchain ideas: 99% of corporate experiments regarding blockchains are better handled with Apache Kafka and multiple archivers. Anything that attempts to be a fast, global ledger has to accept the reality that global ordering is a limitation, not a feature, and instead use logical clocks. The intersection between blockchain enthusiast and distributed system researchers is close to zero. When we look back 100 years, Bitcoin itself will be seen as far more relevant in retrospect than blockchain technologies.