The scenario you describe would be tantamount to the Republican Party committing suicide.
I think it already did that and conservatives are stumbling over the bones.
A Democrat victory next year will end non-Democrat participation in the government. Immigration will be vastly increased immediately and there will be no "illegal" immigration as all immigrants of whatever provenance will be legalized and made citizens either by the fact of their entry or after a three line form is filled out in whatever language is convenient. The Democrats will then have a monopoly on election wins until the new class splits into its own parties. Then the dictatorship will simply swap around among Marxist, Gramcist, Guevarist, and Fabian parties until one of these new elected dictators simply does away with the inefficient process of election.