According to the Pew Research Center by 2050 non-Hispanic Whites will be a minority (47%) compared to all other racial and ethnic groups.
Learn more here: U.S. Population Projections: 2005-2050 | Pew Research Center
Believe whatever you want to believe.
Me, I believe that in about 30-years massive demographic change is going to hit the GOP like a tidal wave and the GOP, if it survives at all, will be reduced to a minor, regional party.
Wait and see.