But the Go compiler only has backends for three out of the seven architectures you listed. So this would seem to be a strike against Go.
It looks like Docker provides binaries for only x86-64 Ubuntu. So slide 24 seems to be more of "we think this is cool in theory" rather than "this really helps us."
Yes and I don't think there are image repositories for other architectures, though perhaps the pi thing may mean an arm repository turns up.
It would be cool if IBM sponsored more powerpc ports of stuff. They do give free access to ppc machines, but they should have people who eg write go backends for ppc64.
It looks like Docker provides binaries for only x86-64 Ubuntu. So slide 24 seems to be more of "we think this is cool in theory" rather than "this really helps us."