That is only the case if you think of migrating as an all-or-nothing. The services that he did manage to migrate went quite smoothly. If he would get stuck with one or two services, was it still worth it to migrate the ones he did manage? If you think it has all been in vain, then yes - its a different takeaway. But obviously Martijn does things step by step and I imagine he is happy even with the progress he made.

In other words, the question is 'is it easy to migrate to a service for which decent alternatives exist', rather than 'do decent alternatives exist for every service you depend on?'

You takeaway depends on what question you are most concerned with.