I was badly disappointed when Google made SketchUp free. I understand why, but I think it seriously undermined the adoption of 3D by professionals. "What, that free program?" was the reaction I often got when trying to sell my services to clients. You still hear it even now.
So Trimble moving away for support from 'Make' doesn't defrost my Kelvinator.
As for SU2018, the release notes seem to show many improvements which will improve my experience with Su.
Release notes here:
https://help.sketchup.com/en/article/141303
This is a long list, I expect to spend at least a couple of hours checking it all out.
I am frankly getting very tired of the naysayers who want bla de bla de bla ad nauseum.
Sketchup is primarily a design/drawing program. That suits me fine.
It has always from the beginning at @Last days applied the KISS principal and continues to deliver on that premise.
If it doesn't suit, please use Blender or something else and stop whinging. (Course you might have to pay for it. 