You know, I curse every time I get stuck with a crappy SketchUp model that "just needs a little updating", but then I think back to times when senior level designers couldn't do anything on the computer, and if they did, it was in ACAD! The fact that they are "modeling" in 3D is a big step forward.
I'd much rather import the model into Revit for 3D tracing or into MAX (pretty good importer with the extension) and work with it than go back to the dark ages of 2D ACAD or fudged hand sketches.
The design of our buildings improves dramatically when they are thought-through in 3D. If we ultimately have to throw out the SketchUp model, so be it, but it's a step in the right direction.
Until Autodesk get's its act together and makes a front end modeler that is as easy to use as SketchUp, we are stuck with it for the foreseeable future.