I don't mean to be pedantic, but I disagree that the Go ecosystem has a good choice for pretty much any functionality.

I think one major omission from the current Go ecosystem is a decent GUI library. There have been some attempts however, to my knowledge, they are mostly alpha/beta quality at best, and most of them are missing important functionality (the major ones I'm aware of are go-gtk, go-ui, go-fltk, wxGo, and none of them could be considered production ready IMHO).

I only point this out because I really like Go, and I think Go would actually be a very interesting language to do client side desktop application development in.