I think a move to Open Source would be great in Europe, but only if the governments using the technologies are actively funding their development.
This doesn't just mean once-off grants, or a bit of cash donated here and there. I would like to see per-user per-year contributions to the organisations that develop these tools on-par with the current spend going towards Microsoft Cloud products.
It can be better than Microsoft, but you need to fund it to be better than Microsoft.