Regarding the decreases: Is there not some correspondence with a general decrease in births within either denomination? Perhaps. However, this cannot explain it all as the seminaries below demonstrate with respect to their own denominations.
According to the Association of Theological Schools, seven seminaries "have generated enrollment growth consecutively over at least the past five years," which "saw total student headcount increase by 43.5 percent over five years." Those would be:
Asbury Theological Seminary, Wilmore, Kentucky (independent evangelical seminary in the Wesleyan tradition)
Midwestern Baptist Theological Seminary in Kansas City, MO (Southern Baptist)
Northern Seminary in Lisle, Illinois (American Baptist Churches, USA)
Shepherds Theological Seminary in Cary, North Carolina (nondenominational with independent Baptist roots)
Sioux Falls Seminary in South Dakota (North American Baptist Conference)
Southern Baptist Theological Seminary in Louisville, Kentucky (Southern Baptist)
Wartburg Theological Seminary in Dubuque, Iowa (ELCA)
According to an online article from In Trust Center for Theological Schools, "None of these seminaries attracted their students from a “growing” denomination. In fact, five are affiliated with denominations that saw membership declines over the past five years. One is affiliated with a denomination that reports stable membership, and one is independent."
"What did they do that enabled the growth? What common characteristics do they have? Interviews with presidents and chief admissions officers explored the reasons for growth.
What they have in common, seminary leaders stressed, is disciplined and focused development of strengths and a 'niche,' and not on copying other seminaries. All stressed the importance of serving the church by training pastors and leaders for the local congregations. Beyond that, seven other common characteristics emerged."
1. Strong, Engaged President
2. Active, Scholarly Faculty
3. Innovative Programs
4. Emphasis on Spiritual Grown and Discipleship
5. Professional Admissions Strategy
6. Doctrinal Foundations
7. Affordability
I'm not sure how our LCMS schools, seminaries in particular, fare compared to these seven schools. We certainly have doctrinal foundations. I would like to think Dr. Rast is a "strong, engaged president," and that the newest president at St. Louis will prove to be one as well.
The article concludes with these thoughts:
Everyone agreed that there is no one “silver bullet” to make a seminary grow. It has to result from a team effort involving the trustees, president, administrators, and support staff. Sioux Falls’ Henson sums it up this way: “If there’s anything we’ve done that has helped our growth, it is making theological education affordable, accessible and relevant while remaining faithful to Jesus Christ. You can apply those practices to any school.” https://intrust.org/Magazine/Issues/Summer-2021/What-makes-seminaries-growAffordable and accessible seems to be key. I realize the first one is difficult for denomination-based schools if the donor base is not sufficient to infuse enough money to effectively reduce cost, although I know that our seminaries in the LCMS have come quite a ways toward reducing tuition. CTS-FW recently reorganized its D.Min degree to make is shorter and more affordable, and I hope that it attracts more pastors as a result. If I was younger I would be tempted to enroll. They also introduced a new Ph.D program in theological studies that bears watching to see if it, too, attracts more pastors.
Accessible is an area that I know our universities have worked on, and I know that Concordia - St. Paul, for which I taught one course in 2020, launched a number of online offerings around that time. It may be an area where our seminaries will also need to take some leadership as well. The SMP program, for which I have taught the last five summers, is almost entirely online. I have no idea if it means anything overall, but my class size has increased considerably the last two years compared to the first three. With the pandemic pushing us to embrace more online options, this may be a large part of the future of our schools.
In the LCMS I know we have some good, quality schools, both undergraduate and graduate. I hope that they grow stronger in the coming years despite overall declines in the denomination's numbers.