I would most certainly agree that expanding the pool can only be a good thing. Just the fact that Western men are searching outside of their own cultures in greater numbers is both a good an bad sign. It is a good sign because it means that men have realized that they do not have to be limited to the dating pool within their own country. It is bad because it says some very disturbing things about the home country's dating pool.
I don't see Western Europe gaining much attention because most men on these forums are looking for what we(western men) would call a more traditional relationship. We are selecting for cultures that expect men to be manly and women to be feminine.
I expanded my horizons past Colombia and the Philippines, and I am certainly glad I did so. I think the most important thing is to find a woman and culture that you can live with. Her views on the roles of men and women in the relationship should match yours. Looks, while important, do not even come close to selecting someone that you will be happy with for the long term. I'm not saying anyone should date someone they consider unattractive, but also realize that while she is a ten in looks, she needs to be high ranking in personality and other areas that will satisfy you for the long term. That was my most difficult challenge, finding someone that had all the other qualities that would make me happy long term.