If student demographics were the main criteria for getting into the ACC, CT and the Northeast would have helped UConn get into the ACC over Louisville.
You are not correct about the ACC schools recruiting students from the Northeast. If you have high school/college age kids, Southern schools have become more attractive to Northeastern kids. In fact, look at where Clemson undergrads come from:
1. South Carolina: 12,906
2. North Carolina: 1038 (+18 in last 3 years)
3. Georgia: 793 (+97 in last 3 years)
4. New Jersey: 570 (+86)
5. Virginia: 498 (+37)
6. NY: 380 (+130)
7. Maryland: 350 (-82)
8. Florida: 334 (+37)
9. Pennsylvania: 324 (+37)
10. Massachusetts: 309 (+12)
11. Connecticut: 239 (+31)
Here are the ACC undergrads by state of origin:
Miami: #2 NY, #3 NJ, #4 MA, #8 CT, #10 PA
Syracuse: #1 NY, #2 NJ, #3 MA, #4 PA, #6 CT
Florida St.: #5 PA, #6 NJ, #7 NY, #9 CT
Duke: #3 NY, #5 NJ.
Wake Forest: #3 NJ, #4 NY, #6 MA, #7 CT, #7 PA
Miami: #2 NY, #3 NJ, #7 CT, #9 PA
BC: #1 MA, #2 NY, #3 NJ, #4 CT, #6 PA
Virginia Tech: #3 NJ, #4 PA, #6 NY, #7 MA, #8 CT
North Carolina: #3 NY, #7 NJ, #9 PA
NC State: #4 PA, #6 NY, #7 NJ #10 MA
Pitt: #1 PA, #2 NY, #3 NJ, #8 MA
Virginia: #3 NJ, #4 NY, #5 PA, #9 CT
Louisville: #5 PA, #6 NJ, #8 NY
Out of the 14 ACC schools, Connecticut is in the top 10 state of origin of 9 schools (I included Clemson). Massachusetts is in top 10 for 8 schools. New York and New Jersey are in the top 10 of all 14 ACC schools.