If my Google Analytics reporting is to be behaved, the peak of Google Reader usage for me was in mid 2008, and by early 2010 it had been reduced to background noise. I can understand based on this graph (and perhaps millions of other graphs like it) that it might be time to call it quits.
It looks like from other charts (that I won't show here) that Twitter picked up the slack, as did Facebook.
Google's "sunset" announcement for Google Reader says that you can get your data out; I'm sure that at least one service will appear to let you load it in and carry on reading.
