I just did a search for pitchers, 1885-2010, with an ERC# of 1.50 or under -- in those 126 seasons there were 107 (an average of .85 per season).
In 2011, there are 31 pitchers with an ERC# of 1.50 or under.
Now, 7 of those 31 belong to 2 pitchers with split seasons, but even subtracting the 5 "extra" seasons of those 2 pitchers that's 26 pitchers with ERC#'s of 1.50 or under.
So out of 127 MLB seasons, 26 of the top 133 ERC#'s -- 19.5% -- came from 2011?
Of course nearly all of those pitchers were relievers with fewer than 80 innings pitched. So let's expand it a bit. Let's look at only 200 inning or more pitchers with ERC#'s of 2.00 or under:
From 1885-2010, there were 77 200-inning pitchers with ERC#'s of 2.00 or under (an average of .61 a season).
In 2011, there are 11 200-inning pitchers with ERC#'s of 2.00 or under.
So out of 127 MLB seasons, 11 of the top 88 ERC#'s for 200 inning pitchers -- 12.5% -- came from 2011?
I don't know, but that seems off to me...