Are you joking that that's what would become of the hypothetical service, or saying that it did materialise but then Google really did buy it and shut it down?
Nobody knows, because the memorial page and Google Tombstone sunset announcement were both hosted on the service, and the only mirror was on Wave.
They announced this in a Google Buzz post.
I remember being super excited when I first read about it in Google Reader, in my feed of Google services that were going to improve the lives of humanity from hereon in.