Next you have to believe that there are significant differences in these races on the genetic level.
There isn't much difference percentage wise, minor differentiation can result in vast physiological changes though. The idea of "pure" races as thought of is pretty bunk at this point given the scope of crossbreeding and population growth that's occurred in the past 200 or so years.
But, the notion that humanity will eventually become an amalgamated species of uniform mixed ethnicity is also equally bunk. Even with the rapid rise to interracial couplings, only one demographic, black males, sits above 10% at 12%. All other demographics fall under 10% with most falling even further to below 5% rates.
This alone would suggest that is not likely to happen, and rather, we will over the course of tens to hundreds of milennia probably see the rise of interbred, bu distinctive nonetheless, races, that will replace the current conceptions of "race" as we consider it 🤔