As I stated originally, I think the this issue is actually 2 questions, what to do to keep the building, and what to do to keep the congregation in the building. I think the congregation is assuming both have to happen when they argue for an events center, while I think you can preserve the outside of the building via an apartment conversion that has little impact on the neighborhood. I'm not a neighbor, and I don't claim to speak for them. I think a coffee, sub or pizza shop would be likely to fail given the competition nearby and on campus, nor would it generate enough income to cover repairs.
The fact that a congregation of 60 (and dwindling) needs $1.5 million to make basic repairs speaks volumes.