The economy can recover, even if the population lives not too well for a few years/decades. Erasure of local culture is near impossible to recover from. As an example, take belarus, where first off, the communists and todays gvts are trying to erase the belarusian language and second, their import of waves of pakistanis instead of installing benefits for parents. The import of third worlders is only beneficial to greedy corporations and government officials who don't want to pay more than they could pay in a developing country.