Apply what you did to the last 20 years and things look very different.
I'm not sure if you think the American looks better of the course. Shrink it to the last 20 years, and all the accomplishments of Cincy and Houston (let alone Temple/SMU) go away.
The BE is diminished too, but, DePaul has more NCAA appearances than the bottom
5 American schools, and Creighton more than all but the top 4. The total number of Titles go to the American, and Final Fours are tied...but it's pretty much UConn and the midgets, as you see when you remove them:
1994-2013
New Big East
Butler – 2 Final Four, 2 E8, 4 S16, 11 NCAAs
Georgetown – 1 Final Four, 2 E8, 5 S16, 12 NCAAs
Villanova – 1 Final Four, 2 E8s, 4 S16s, 12 NCAAs
Marquette – 1 Final Four, 2 E8, 5 S16, 13 NCAAs
Xavier – 2 E8, 5 S16, 14 NCAAs
Providence – 1 E8, 1 S16, 4 NCAAs
St. John’s – 1 E8, 5 NCAAs
Seton Hall - 1 S16, 4 NCAAs
Creighton – 9 NCAAs
DePaul – 2 NCAAs
Over 20 years: 0 Titles, 5 Final Fours, 12 E8s, 26 S16, 8.6 NCAAs per school
American
Connecticut – 3 Titles, 4 Final Four, 8 E8, 11 S16, 15 NCAAs
Memphis – 1 Final Four, 3 E8, 5 S16, 11 NCAAs
Temple – 2 E8, 2 S16, 14 NCAAs
Cincinnati – 1 E8, 3 S16, 15 NCAAs
Tulsa – 1 E8, 3 S16, 8 NCAAs
UCF – 3 NCAAs
Houston – 1 NCAA
USF – 1 NCAA
Tulane – 1 NCAA
East Carolina – 0 NCAAs
SMU – 0 NCAAs
Over 20 years: 3 Titles, 5 Final Fours, 15 E8s, 24 S16, 6.27 NCAAs per school (with one more school)
Without UConn: 0 Titles, 1 Final Four, 7 E8s, 13 S16, 5.4 NCAAs per school