"I haven't seen a black swan, ergo it's not real."
I've been burned by this decline in the past.
From creepy results i.e. first suggestion before typing was something I spoke near the Android and I never searched for before; to not finding what I was searching for before successfully, Google has started declining.
It would be nice if you provided a few real examples so that we would see how Google was so fantastic and found everything magically but then went to shit.