No, I was just pointing out a drawback. Of course there are advantages too.
In this particular case, though, I wonder why the Go team is planning to spend a lot of effort rewriting an already existing compiler. Rewriting a popular project from scratch can be a dangerous temptation.
Also, you don't have to download a binary of Go to compile the latest Go. You can download the Go source back when it was compiled by C, compile it, and then compile the later, Go-sourced versions, if for any reason you need to go that far.
In this particular case, though, I wonder why the Go team is planning to spend a lot of effort rewriting an already existing compiler. Rewriting a popular project from scratch can be a dangerous temptation.