Re: Cost is the smaller concern
"User training was the problem there. I.e. they didn't do any"
This is the standard pitfall of migration projects. If bosses are persuaded on the "Free"/cheaper/mo licensing costs part then they're also likely to be so tight they won't authorise the expenditure required for training even if it's cheaper than a years' continuing subscription charges associated with remaining on the status quo.
Companies/organisations which plan well, make training resources available and migrate smoothly are not newsworthy. Munich is far from the only example, but being first they get all the attention and FUD (whilst others use their mistakes as lessons in what not to do). Pioneers get arrows in their backs, etc.