That's assuming that the descendants of immigrants will keep the religion and not decide to be assimilated into the non-religious or Christian local community.
One of my Zen teachers (non-Asian) said that what he regretted about retreats was that there was no opportunity to get to know the others he spent the time with there. So on his retreats there are quite a lot of community programs, discussions, in a not so organised format. It is not a formal retreat at all and hardly about doing a lot of meditation. However, it is not advertised for outsiders, but everyone is welcome.

