I think most Americans consider the electoral college a funny historical quirk and 'getting more votes' is the source of the mandate to rule. Except when popular vote splits happen in which case everyone remembers that we've got a bizarre system that very, very occasionally returns a different result than the popular vote.
Although, who knows. Of the 5 popular/electoral splits that have ever happened, 2 happened in the past 16 years. Maybe shifting demographics will preserve republican electoral competitiveness even if their fraction of the total vote shrinks.