As a hobby, I record the number of votes received by the
best nodes of the month and year at Re: Selected best nodes - nothing recent, why?.
As you can see from that node,
while there was a significant drop around 2009,
the number of votes for best nodes of the
month/year has been stable for the past year.
That said, the pre-2009 glory days,
when all twenty best nodes of the year were
100+ and a really good node garnered over 200 votes,
appear to be over.
I speculate without proof that we lost quite a few
users (e.g. brian d foy) after the
"hacked catastrophe of 2009" --
which may partly explain the drop in votes received
by the best nodes of the month/year around that time.
Changes to the Perl monks levels/voting
may also have had an impact.
Update: see also: