Java will be around forever, and becoming an excellent Java developer will absolutely remain highly lucrative for a very long time. That's its reputation at the companies I"ve worked for over the last 10 years (all startups). Go is more of an anti-language imho. Among myself and similarly minded colleagues, I would say its main attraction is its lack of features and it seems a haven for people that are grumpy like me. I always get a chuckle when I see it framed as "hip" because its just never felt like that to me. Elixir is Hip. Rust is somehow Hip. Go, just not in my experience.