That's a fair response. I can agree with the merit of your suggestion, Office 2003 is basically the same product and is moderately comparable in modern times. It doesn't have the OOXML formatted files that its successor used, but most modern systems can read the binary .doc and its siblings to a fair degree. It shares the advantage of most desktop applications in that its interface can remain literally unchanged from the day it was installed, for good or bad.
I think I'd argue that some of your current iteration examples are a bit hard to compare to those that Google shut down. Apart from shopping and 411, which have easy and popular alternatives in Amazon, eBay, and local 411 telephone services, all the rest are pretty much services that only have context on the Internet. It's difficult to compare a venerable service like retail (Amazon, eBay) to Wave, which was an experiment in combining IMs, email and Google Docs. It's certainly easy to imagine how a service like Amazon could survive without the Internet, albeit with some hardships, but not as easy to imagine a service like Google Wave. I agree, those services you listed off are still around in their current iterations that mimic their 2005 iterations reasonably well, but they have the advantage of being instantly recognizable and accessible services with direct offline analogues, something that Google Wave, iGoogle and the others didn't have.
Getting back to Office 2003, I have to point out that many of the big tech companies are even moving away from that format of desktop application. Microsoft, Apple, and of course Google, have been releasing services (Microsoft 365, iWork with iCloud, etc) that blur the line between desktop and web applications. More companies, such as Adobe, Autodesk and other industrial products are moving in this direction as well, taking their software into the cloud and offering it on a subscription basis. These products will be just as subject to the whims of their creator as was Google Wave, as fleeting as iGoogle, and able to be redesigned, restructured, have its features removed or reorganized or replaced, and possibly shut down, all on the whim of the company. Subscribers have no ownership in this situation, and are just as beholden to the goodness of the company they subscribe from to maintain the product. Even with contracts and money flowing, a business could easily decide to shutter a product line in favor of something else, especially those with broader categories of applications (e.g. Microsoft, Adobe and Google). I would propose that we haven't seen the last of shuttered services like these, and the next time it happens it will be far more shocking than Google Reader ever was.