Sure, it could be done. Lots of things could be done to Go. The people who invented it are among the most brilliant computer scientists alive. It's a pretty sure bet that they know about, and in great detail, every single thing people complain Go doesn't have.

So every thing that is "missing" from Go isn't in it for a reason.

"Perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away." -- Antoine de Saint-Exupéry, Airman's Odyssey