But they have, multiple times? First it was just giving people links to godep when people complained in github issues. Then it was a tacit "we like this" about gps and glide. Then it was a pretty-much-official-blessing of dep. Now it's a super-official-now-we-mean-it implementation of vgo. I recognize this as a pattern because I do it all the time, software engineers constantly re-write things from the ground up when they don't care about actually solving the problem and just want to play around with cool new ideas.
As far as the vgo spec, I'm not against it per se... I like most of the general conclusions, but none of it is new. We've had these ideas in the Go world for a while. Most of them have even been implemented! Why can't we just slowly transition an existing tool? Or maybe implement a common library that individual tools can use to solve the problem in their own way? Oh wait we already did that and it got abandoned. Until we see a tool with a stable API that solves the 80% use case and lasts for over a year I'm not going to get excited about the new flashy thing.