Sounds like a waste of good missionaries. Europe is too far along the road to extinguishing itself through simple demographics. No sense in putting an "American metal roof" on a house already destined to destruction by termites. Find a structure that has a future-- like Asia, Africa, S. America, or Antartica.
"Sounds like a waste of good missionaries."
That's ridiculous. Most Europeans have no idea what Christianity really is, since their churches have been so infested with liberal theology for over 100 years now. There is no compelling reason to go to church at most churches in Europe so the people just don't go. Real Christianity would be a huge breath of fresh air to the Europeans, as it truly is largely unknown.
Declining demographics can be overcome in one generation of large families. It is far from too late for Europe, and giving up on whole societies is not God's way.
No it's not. Our SoCal church has sponsored some missionaries, formerly church staff, to a small town in southern France. France is as Godless a country as any other in Europe but reports are that most French are starving, literally starving, for spiritual depth. Our missionaries started a church from scratch in a commercial building and, after 2 years, it is thriving.
Don't write off Europe. In one generation it lost its soul and it could regain it back in another generation. But equally important is re-teaching European women that having children is a good idea.