> I'm not sure really how to phrase this but, my question is, is the industry hurting enough to take an "off the street" IT guy and train them?
No, I don't think they would be super-excited about a zero-experience applicant.
But in your case it sounds like you have a fair sum of more traditional systems administration experience.
There are actually quite a few free(ish) educational resources out there in the wild to help you not be a zero-experience applicant.
https://www.ibm.com/it-infrastructure/z/education
https://www.ibm.com/training/mainframe/
https://www.ibm.com/blogs/ibm-training/free-course-announcing-learning-cobol-programming-with-vscode/
https://www.coursera.org/professional-certificates/ibm-z-mainframe
https://www.mainframes.com/Training.html