Actually the OP only wrote that the current state of the ecosystem is surprisingly mature, but he doesn't recommend writing anything serious in it yet.

Personally I don't see the point to implement a typical web application in Rust - the performance improvements you get will be lost on IO-bound applications, but you'll still be saddled with the complexity of the memory management. I'd rather suggest to rewrite VS Code or the Slack client in Rust (i.e. apps which currently use Web technologies on the desktop) - those would definitely benefit more from increased performance and reduced memory footprint...