This is a 'scorecard' by conference for 2015, the 17-th for the 64-team playoff system where every conference gets an automatic bid. You can find the full results elsewhere.
My original motivation for this summary was the thought that the regionals are a major source of inter-conference and inter-region play that helps one evaluate the relative strength and (possibly) future selection or seedings of teams from various regions and conferences. I think it still serves that purpose.
Current status: Super Regionals are complete.
Here is the 'histogram' of the success rate for the 2015 NCAA regionals.
I tally a Regional champion under "win" and the Super-Regional champion (the team that goes to the CWS) under "champ" so the "champ" column is unchanged from the older 48-team system.
Note:
There are no changes in the conference lineup this year, which still has 31 conferences,
all with automatic bids (so 31 of 64 are automatic qualifiers).
One notable change is that Maryland left the ACC for the Big Ten, which has 13 of its 14
teams playing baseball and is now competitive on the national stage.
------ wins ------
Conference Number 0 1 2+ win champ comments
========== ====== === === === === ===== -----------------
SEC 7 1 1 1 4 awesome; 5-2 start, half of teams in
ACC 7 1 1 1 2 2 fair; 6-1 start, half of teams in
Pac-12 6 3 3 zip 4-2 start, more than half of 11 teams?
Big Ten 5 1 2 2 5-0 start, now Big 13 with Maryland
American 4 1 3 2-2 start
Big 12 3 1 1 1 2-3 start, Texas BBQ'd
Mo-Valley 3 1 1 1 1-3 start
Conf USA 3 1 2 0-3 start
Big West 2 1 1 team in CWS in 2014 and 2015
Colonial 2 2 2-0 start, won 2014 regional over N seed
Big South 2 1 1 both teams were deserving
SunBelt 1 1 also won a regional in 2014
Atlantic-10 1 1 solid showing
Ivy 1 1 Columbia took Miami to final game
Big East 1 1 not many left but still quality
West Coast AC 1 1 won a regional in 2014
Horizon 1 1 better showing than in the past
Mountain West 1 1 .
America East 1 1 .
WAC 1 1 shadow of its former self
Atlantic Sun 1 1 won a regional in 2014
Southland 1 1 champ was #7 of 13 teams
Southern 1 1 Upset national seed in 2014
SWAC 1 1 Upset national seed in 2014
MEAC 1 1 Regional wins in 2014 and 2002
Metro Atlantic 1 1 Last regional win was in 2014
Patriot 1 1 .
Northeast 1 1 .
Ohio Valley 1 1 .
MAC 1 1 .
Summit 1 1 .
independent 0 - still just NY Tech and NJ Tech