I think your analysis would be spot if it weren't for one simple fact: you assume that the best technologies win, and this is clearly not the case.

Ruby and PHP are perhaps the two slowest programming languages ever invented. And yet, they dominate the web.

Did Windows win the desktop wars because it was technically superior to Unix? No. And yet, it still won, and continues to dominate. Even where it's losing ground -- to OS X -- the reasons have little or nothing to do with the tech, but design.

That said, using the right tool/technology/language/framework for the job certainly can be an advantage, and I personally hope to demonstrate the superiority and brilliant simplicity of Go by leveraging its legitimate, inherent advantages as best I can... to build a distributed computing platform... thing. Yeah.

tl;dr -- I think you're wrong, but I hope you're right.