[core-workflow] Time to switch off AppVeyor and start requiring VSTS for Windows?

We had to turn off AppVeyor as a requirement today due to it not running any builds for the last 20 hours. Ned Deily suggested that since VSTS on at least Windows has stabilized that maybe we should switch off AppVeyor off entirely and make the Windows VSTS builder required. Since https://python.visualstudio.com/cpython/_build/index?context=mine&path=%5C&definitionId=4&_a=history shows the builder has been stable I would like to make this required for master today/tomorrow and then flip it on for the other 3.x branches on Friday if we don't see any instability. Any objections/opinions about doing this?