Having programmed a bit of Rust, while Rust will definitely be a very capable language for web frameworks/applications, I don't think that it'll ever be the mos

Having programmed a bit of Rust, while Rust will definitely be a very capable language for web frameworks/applications, I don't think that it'll ever be the most popular choice. To be honest, if you think about your Rails controllers/models, 1. There isn't really all that much there(fat-models/controllers are pretty slim when you're language was built for web browsers/operating systems). 2. Think about your priorities. I can guarantee its not performance or safety. You want to build a content-rich/feature-full application. Basically, prioritize iteration speed, at all costs. No matter how good the Rust frameworks get, I don't think Rust will be the "iteration speed" language. Meanwhile, I think, in the spirit of wycats' comment, image if ActiveRecord, Unicorn, Rack, the template renderers, etc, were all built with Rust, but still used through a Ruby interface. That would be quite the performance improvement for Rails and it would be interesting to compare its performance characteristics to a fully Rust web framework/application.