Howdy, just wanted to add my 2 cents about what's going on with SketchUp 2018.

SketchUp Pro is not going away, and the commitment to it is greater than ever.

SketchUp Make 2017 is still available for download, and will be for some time to come.

SketchUp Free runs in the browser, even on inexpensive Chromebooks. So people who would otherwise not be able to afford to use SketchUp now can.

Ruby extensions don't run (safely) in web browsers, at least not yet, but that won't prevent people from being able to use SketchUp. It's a bummer but one that should eventually get resolved.

I remember when Google bought SketchUp and some folks said "that's the end of SketchUp". Well it didn't quite turn out that way. This is just the next step in the evolution of making 3D accessible for everyone.