I know Fortran. As to it becoming "more and more expensive to run it", that kind of depends. Most of that Fortran code isn't touched very often. The cost of sw

I know Fortran. As to it becoming "more and more expensive to run it", that kind of depends. Most of that Fortran code isn't touched very often. The cost of swapping it out is huge. Swapping it out piecemeal isn't as expensive money-wise, but it carries large risk. Should it be ported out? Sure. Can it be, in any reasonable way? That's a harder question, and it's not as cut-and-dry as you make it sound.