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Not saying there will be zero attrition or that the Cloud won't impede growth, but people have no idea how entrenched this stuff is. There are IBM systems that make things run that people have no idea about it, and the code was written in the 1960s. This is sticky stuff.

People who have never seen the guts of a corporate IT system are at a fundamental disadvantage when evaluating these types of companies because the level of stickiness that exists is just phenomenal and beyond belief to most people. In many cases, the same code has been running for decades and the people who wrote it are long gone. Defined business processes critical to the operations of a business may reside in legacy systems that few in an organization even understand. Therefore, it is not so easy to simply jump to new technology because the logic behind existing systems may be so poorly understood and documented that a jump to a new system would entail significant business risk. Most CEOs regard IT as a back office function, not as a source of potential differentiation or competitive advantage. CIOs get the call when systems are broken and system migrations go poorly but usually just a quick slap on the back when things go well. In other words, there is often an asymmetry between the risks and rewards of a major systems renovation tilting the default toward inaction.

This is not to say that systems upgrades are impossible or that ancient code will last forever, only that the period of transition is longer and more drawn out than most people appreciate. The cloud is real and has benefits, but also poses certain security risks as well as execution risks as legacy systems are migrated. Furthermore, robust clouds are not running on a bunch of crappy commodity PC hardware. I'm a bit removed in terms of years from the industry but I doubt that much has seriously changed in terms of human nature or the challenges of systems migrations. We have healthcare.gov as a wonderful example of how difficult it is to stitch together multiple legacy systems in a coherent manner - even in a situation that is unbelievably mission critical for the President who controls resources far in excess of the typical CEO yet stands powerless to fix the mess.
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