I don't have the numbers, but I suspect the brain-drain is near total, and irreversible for a few generations. The last time I did a round of interviews, about two years ago with half a dozen companies in Chile, at least half of the senior engineers, and many of the hiring managers, were Venezuelan. None of my Venezuelan friends plan on going back, although they do visit, and I think would like to go back if conditions were different- Venezuelan culture is quite a bit more "latin" than Chile, so there's a fair bit of culture shock for them. As it is, they are putting down roots, starting families, opening up businesses, etc, and I don't think they'll be leaving soon, if ever.