We don’t know if chains are going the way of the penny farthing, but they might be. Polyurethane/carbon fiber belts don’t rust or need lubrication. They’re quieter, smoother and longer-lasting than a chain, and just as efficient. They require zero maintenance and won’t grease up everything they touch.
And, if you’re skeptical, go grab your penny farthing and wheel over to your local bicycle shop for a demonstration. Just bring some degreaser and a load of towels in case you jump a chain on the way.
(For you “purists” we made our fixie with a chain. But we might just change that soon…)