The 21 team league isn't happening that is the only way Temple can be screwed.
You won't be screwed no matter what. Even if the strength of basketball leaves, the new Big East (CUSA 2.0) is going to have more revenue from TV than all but five conferences (SEC, Big Ten, Pac-12, Big 12 and ACC). You'll be fighting among the poorest of the rich rather than the richest of the poor. 20 years from now, you'll think "Thank God we didn't drop football when the Big East kicked us out!"
The 21-team Atlantic 10 is never happening. Let's look at the Big East schools options if they leave football:
#1 - "A21" - Atlantic 10 with 21-teams (St. John's, Villanova, Seton Hall, Providence, Georgetown, Marquette, DePaul join A-10)
#2 - "14A" - St. John's, Villanova, Seton Hall, Providence, Georgetown, Marquette, DePaul split and add Xavier, Dayton, Butler, Saint Louis and VCU/Richmond and Duquesne
#3 - "14B" - Same as 14A, only with one of VCU OR Richmond, and Creighton
Footprint: People living in the metro areas where there are teams in the conference:
A21 - 54,953,306 (TV contract split 21 ways)
14A - 54,587,930 (TV contract split 14 ways)
14B - 55,465,040 (TV contract split 14 ways)
If leaving was worth their while (guaranteed at least $2 million each from TV), that would make.
A21 - $42.0 million TV deal - $2.0 mil each.
14A - $41.5 million TV deal - $2.9 mil each.
14B - $42.5 million TV deal - $3.1 mil each.
You can argue the value of the TV deal, and assign any dollars you like. But the difference of the Amherst, Olean and Kingston markets are not worth splitting any TV deal an extra SEVEN WAYS. You have three tiny markets and five redundant markets; and that's why they'll never join the A-10.