I think it's possible to have that same output in mid age. The difference is enthusiasm. It's still novel.

Further one of the games in the Spring Future Games show mentioned they were developed by a small team, using UE5 and AWS Gamelift, in about 9-12 mo.

I think a game in six months is doable with the proper talent. It's not gonna be Elden Ring in scope. But NES Legend of Zelda in 180 days seems possible now.

Tools like Github Copilot & NVidia GauGAN can also assist. But may be a steep research curve before resulting in actual workflow compression ;)