Chance of incidence times size of the risk is a good way to do risk management. In this case the chance is tiny and the size of the risk is too. If this worries you then I am afraid I will not be able to reduce your fears but please read up on the actions EU data protection agencies have taken in the past. I'm sure you will agree that the risk to a blog is not quite zero but very close to it and besides, you could simply try to comply with the law and then there won't be a problem at all.
It's the armchair lawyers doing sneaky stuff that they will try to continue to do that should be worried here.