At that point, non-Leftist Americans will see that they have no voice, no representation above the local level and will see that their homeland has been permanently taken over by people (liberal whites at first) who hate them and hate their values.
At that point, will it be "Again in the course of human events..."?
or (more likely) just acquiescence and withdrawal from politics, taking solace in what remains, particularity entertainment diversions, nostalgia, intoxicants, etc?
Then Republicans will run Hispanics. Cubans usually vote Republican. Mexicans whose families have been here for along time are more assimilated and aren't in love with illegals.
And you are assuming the current Democratic coalition will remain together -- that African-Americans, Latinos, Asians, gays, feminists, labor unions, and White liberals think alike and won't come into conflict.
You seem to have it,
NUMBERS Not Warfare.