@nygl where maybe I should clarify that "change of people" can mean either getting different people or getting/allowing people to change their behaviour.

I mean, in theory, "tech" people all like learning new skills don't they? </sarcasm>

@nygl Perhaps you want to be clear whether there is also a need to have a change of IT people/management. I've often observed that it is they who prefer Microsoft infrastructure.

In short, because it requires less knowledge and skill (as in general knowledge and general skill) and that's something they're often not prepared to invest in - regardless of whether than can be done for fewer overall $$.

Reality is of course a bit more nuanced, but that's the brief version of this line of thought.