So it looks like my sad prediction is coming true: news of Windows 'Lite' on the horizon leaves Windows S spiraling to the same fate and demise as Windows RT (and Windows 8/8.1), there is no way the Surface GO will have any impact on the Education market. The battle for schools has been fought and won - by iPads and Chromebooks. This is a repeat performance, just like in mobile, where 'you know who' said there was 'no point having a third operating system'...
Windows in S-mode isn't dead. Windows Lite
is S-mode. First, you have to consider what S-mode truly is - it's full Windows. The only limitation of S-mode is it can't run 32/64-bit applications. But the ability to do so is easily unlocked because, again, S-mode is just full Windows.
Windows Lite will actually be what Microsoft intended to do with S-mode, and that's offer a computer with a lightweight operating system that can only run UWP and PWA applications. You are going out of your way to turn this into a bad thing. It absolutely is not.
Furthermore, Microsoft actually
increased their market share in the education market last few quarters. And that's not to take anything away from Chrome OS which is still kicking tail, but it's not a two-horse race with both Google and Microsoft eating into
Apple's lunch. Windows Lite will further help Microsoft compete against both companies.
As for your Surface Go comments - do you know when Windows Lite is coming out? Next month? This year? Next year? No one knows. So trying to equate the announcement of Windows Lite as a sign that the Go won't have an impact is a flawed argument. Insti Gator is much more on-point as to what "success" means for Microsoft. Success means getting Windows into the classroom, not getting a particular device in there.