Sure they can be. Rust just isn't able to compete in some areas where Go is objectively easier and better, but they're areas which can be fixed with improved documentation, training, and libraries.

YMMV, but I think people just want something fast, productive, and safe by default. Normally you had to pick just two, but Go gives you 2.5 (Not as safe as it "could be") and Rust only gives you 2 right now (Not as productive, libraries too immature), but it is on it's way to giving all 3 as soon as libraries gain maturity.