Not a direct response to your question, but I do think progress studies is very complementary to longtermism. In particular, it seems to me that longtermists are often much more interested in big ethical ideas rather than big empirical ideas. Yet, if anything, the latter are more important.
So I expect that most of the high-level research in progress studies (e.g. about the industrial revolution, or about principles for institutional reform) will be useful in informing longtermist’s empirical ideas about the future.
This will be less true for research into specific interventions.
Not a direct response to your question, but I do think progress studies is very complementary to longtermism. In particular, it seems to me that longtermists are often much more interested in big ethical ideas rather than big empirical ideas. Yet, if anything, the latter are more important.
So I expect that most of the high-level research in progress studies (e.g. about the industrial revolution, or about principles for institutional reform) will be useful in informing longtermist’s empirical ideas about the future.
This will be less true for research into specific interventions.