No amount of money would persuade me to have another child.
No idea for all of Europe but Greece and Italy are already quite low and I think they've already started losing population.
The Greek government have introduced some sort of third child allowance, but things are so expensive it won't make a difference. The prices in the supermarkets here are comparable to the UK but the average wage is only about 14k a year. Baby products are more expensive here than the UK. Also, most people live in apartments and they don't really have the space for more than two kids.
I've been back and forth to Greece since 05, and been living here since 08. Even when I was a student most of my Greek classmates only had one sibling, whereas my Irish classamtes usually had two or three siblings. So from what I've seen this has been on the cards a while. It's really unusal here for a family to have 3 or more kids, I know and Irish guy with four kids who worked in the embassy here and when they went places they could hear the Greeks commenting to each other that this family had four children.