Author here. I spoke about Python and Fortran to an association of chemical engineers a few nights ago. Some folks here may find the slides interesting.
I'm always sad that the power systems industry has mostly moved from Fortran to C++ as the Fortran is much easier to read and doesn't make overzealous use of OO principles.
I use a lot of Python for process automation and data analysis. If I had to put numerical code in production it would probably be in either Fortran or Julia. My problems with Fortran usually boil down to libraries for certain things like database access. I did a little googling and there is some ODBC support, but it doesn't seem to be very good.
I agree -- many general purpose domains are lacking Fortran libraries. Regarding DB access, Arjen Markus has an interface to SQLite, but I'm not aware of anything else.
As almost everything out there has a C API, getting it compatible with Fortran is a matter of doing the grunt work and writing the wrappers around the C functions. To me, the lack of such Fortran libraries just shows there hasn't been much need for it.