Well, this service has been live and maintained for almost 3 years. And, if you self-host, then you can guarantee longevity.

Github, Airbnb, Shopify, Stripe, Basecamp, Instacart, Zendesk, Square, and others seem to be staying online, too.

I've written more about my Ruby opinions here: https://www.contraption.co/rails-versus-nextjs/

(Discussed on HN here: https://news.ycombinator.com/item?id=43130546 )