Sketchup is just a tool what ever your "craft" is you must have an assortment of tools. How many of us here don't grab for the drill with a screwdriver bit to put in a drywall screw. Ofcourse I could use a regular manual screwdriver but the drill version does it so much faster. Now there are power drills and then there are monster super power drills costing thousands of dollars. If you own a construction company you may own a super power drill but even then sometimes a simple cordless drill will suffice and a good craftsman and business person will choose the appropriate tool for the task at hand.
anyway
Sketchup was, is, and always will be just a tool but put it in a teenagers hands and you would expect it to be used differently then if you put it in a 40 year old hands. The tool can and will need to be able to work for each and all in between.
Having said that if Google does not improve the tool for all users than those users will find another tool. The practice of architecture is only one small sector that Sketchup can be used for, and quite frankly even sketchup version 3 satisfied most of the architects user needs. the added features in SU6 from SU3 are numerous but the core stuff in 3 is what makes 6 still the appropriate tool. With the inclusion of ruby as a plugin - addon language SU has for all intents and purposes become open source. Much of the functionality extensions we all get excited about lately are not coming from Google they are third party. Sketchup is like that person who seems lost in the party with out a purpose kind of a lonely geek talented but uninteresting.....until he has a few beers and then all of a sudden he's the life of the party telling jokes and hitting on girls and making use of the extensive knowledge of politics and current events he has in his brain.
SO I see a long and illustrious future for sketchup but at some point its humble beginnings will be lost because out of the box it is essentially bland but when you add on the third party features available to it you can transform it into a powerful full featured set of tools.
Think about AutoCAD, 3dmax, maya, etc. They all had very limited but focused tool sets to begin with I think I still have a copy of version 1 of 3dsmax If memory serves me correctly the application was only 3mb large. I imagine its quite larger than that now. My point is that Autodesk bought out many of the third party applications that were created to extend the capabilities of the simplistic applications they had. Their users were telling them that. Autodesk fear was that one day the users would become addicted to this third party application plugin and then the developers of these plugins would be able to dictate thier own development course.
So I see Google doing the same thing with SU7 Emulate internally some of the features being developed by third party developers (Subdivide and smooth, FFD, Vray, Maxwell, Soap Skin, Podium, Etc. Etc. Etc. or if economic work out buy them and incorporate it in a pro version)
I seam to remember at some point AutoCAD was not very good at actually performing mundane and repetitious day to day drafting tasks that architects needed so along came a third party add-on called softdesk, and a competitor Kativ well Softdesk was bought out and AutoCAD architectural desktop was born.
Wow This is going on.
I for see a series of Google add-ons to SU pro to essentially create SU-Architect version SU-Animate version SU-Earth version SU-Lively version etc.
Essentially these industry specialized versions will incorporate tool sets that are specific to that industry.
So I would not worry if there is a version of Sketchup that is being used by teenagers to populate Lively because its only natural that they use SU for that purpose because its well suited for it. but in my SU-Architect version the same and other tools are well suited for my profession.
BTW I did visit Lively and apart from trying to have a conversation with a female avatar I found very little use for it.