We are on a 23-year countdown to the demise of Caucasian Numerical Dominance -- by 2042, there won't be a racial majority in the country. Expect all the Breitbart-style racial torque to get noisier and weepier as this happens. The GOP will either have to abandon Trump-Bannonism or fall completely apart.
If they were smart, they'd have started considering lighter-skinned Hispanic people "white" a while back. George Zimmerman offered them that on a silver platter - and even murdered a black kid for no reason just to make it clear - but they still insisted on tossing it out.
The Democrat Party needs to be careful not to fall into the trap being set before them too. Don't become the party that merely panders to minorities to get votes. Become the inclusive party of all and counter the bigots of the alt-right on that basis.
Basically, the thing they've been doing since 2000 (Clinton wasn't exactly the guy that tossed white people aside to favor black people - see welfare reform, his escalation of the War on Drugs), when Gore decided pledged to take police brutality seriously, at least.