I think that's a reasonable timeline, actually - sorry if what I wrote was confusing to imply "right now". I meant to say "It would be the right thing for Google to announce the timeline to remove SPDY at this point in time."
A year head's up gives people plenty of time to update their sites, and sounds fair and reasonable.
It's going away, just maybe not soon enough for everyone's tastes. From the blog:
> We plan to remove support for SPDY in early 2016