After the frustration I faced when google killed iGoogle, I decided that I would never again become invested in anything from Google other than search and email.
Is the expectation that Google maintain products even when they're not profitable or beneficial for them? I can understand if they don't provide a reasonable sunset date but investing yourself in any company's product is a risk. At least with Google you'll get notice instead of a static html page one day announcing the shuttering of the service.
It's also a problem with a web-centric application developers. With a traditional software application, if the developer stops putting out updates you still have working software. With Google's services, you no longer have working software.
I completely understand that Google has to retire products that are not profitable.
I'm speaking only of my own frustration.
There are ripple effects that impact Google's other businesses. I wasn't willing to switch to Google Plus for that same reason. I'm certain that I'm not the only one.