"one must assume that any soon-to-be-ex-IBM employees effectively interviewing for their own jobs at NCR will probably get less generous terms offered to them"
I know nothing at all about the specifics of either IBM's or NCR's internal processes, but I'm jaded and old enough to have an opinion on this assumption.
Suppose, for instance, NCR has fewer management / middlemen in the product chain, pushing paper and "costs" around internally, and jacking up the price customers see? It seems to me entirely plausible that competent staff could get equivalent or higher compensation for switching companies, without creating a necessity for higher prices.
I'm cynical. I seriously doubt it's the compensation of the people actually doing the work that's to blame for IBM's losses of contracts.