Beware of Tunnel Vision
There are CIOs (some are now deservedly ex-CIOs) out there who bet their career on replacing mainframes in IT shops where that platform was quietly doing its job without presenting major challenges. It's sad when a CEO reads an airline magazine ad that touts short-term cost savings via commodity hardware, then (s)he gathers a team of advisors who fail to look beyond the first few years of such an IT platform (hardware and software) change and almost universally fail to consider subsequent costs related to that change, such as data center cooling, electrical, square footage, HW & SW upgrades, staffing, etc. Instead of viewing the mainframe as one of several computing platforms or the "center of gravity" platform, these CIOs who are perhaps too young for the position or otherwise inexperienced (line-of-business executive who talks a good tech game) kept doubling down on their bet that the mainframe platform was obsolete and needlessly expensive. Hindsight is 20/20 and it's clear that plenty of these mistakes were made. The problem will continue because so few people admit to having buyer's remorse, then just stay on the "new" path of spending more to get less. How many CIO candidates out there have a truly open mind for today's mix of applications that could span on-premises, in the Cloud, mainframe, distributed and mobile? Those apps don't even have to run completely in-house when considering SaaS, PaaS and IaaS.