Thanks for the great reply. I had the pleasure of spending a year replacing an APL program on an IBM mainframe may years ago so understand a lot of the points y

Thanks for the great reply. I had the pleasure of spending a year replacing an APL program on an IBM mainframe may years ago so understand a lot of the points you’re making. I think that the missing element in my initial analysis is that many firms don’t have much in-house expertise left on these systems. They’ve cut to the bone or outsourced. And for management replacing is huge risk for limited upside - even if the economics make sense.