When, in the future, will the human Caucasian race be obsolete, or extinct?

With all this global island & country hopping by non-Caucasians; inter-racial marriages; inter-racial breeding; non-Caucasian children being adopted by Caucasian couples; rapes; mail-order-brides; surrogate & test tube babies............& so on............... will the human Caucasian race, as we now know it, taper into extinction? How long will it take?