"It becomes too hard for a small team to write a browser" can't be both the horrible dystopia you're trying to avert and the catastrophe from a few years ago that you're still mad about.
But a browser that is 'Written in Rust™' which that runs blazingly fast, prevents segfaults, and guarantees thread safety can save us right? That should also be a 'selling point' to challenge browsers written in unsafe languages right? /s