As a proponent of Jacksonville having a urban university, i appreciate this article.
Some people may ask, why did they all leave?
Many left either to get more space cheaply outside the urban core, or they went where the money was.
No doubt that the growing ownership of autos after 1910 had an impact.
I have done similar research on the same subject in the city of Chicago. Why do some stay in the city (DePaul, Loyola) and why do some move (Northwestern).
Also the migration of religious entities out of the core was common in this era across many cities.
Some for growth, some to get away from persecution, some for racial reasons. While brief, the use of buses to support ministries was a big factor in the growth of the first mega-churches across the US in the late sixties to the late 70's. Today, bus ministries are uncommon.
There are hundreds of niche Catholic orders throughout Chicagoland that all started in the urban core in the 1800's, bought land in the then exurbs only to be surrounded as the suburbs grew to them. Its an interesting subject.