I once worked for $CORP that did a cost/benefit analysis of their mainframe, and it came out way cheaper in terms of TCO than the alternatives. The biggest chal

I once worked for $CORP that did a cost/benefit analysis of their mainframe, and it came out way cheaper in terms of TCO than the alternatives. The biggest challenge was getting staff, so there was a big line item for costing out 'training and nurturing whole-career staff'.