Republicans are going to have to learn how to win the cities.
Long-term nations are becoming more urbanized. This means that more and more voters will be in urban areas. Hence, conceding them to the Democrats is self-defeating.
Cities are also the economic powerhouses of the nation. Blue states are the ones which pay more to the federal government and subsidize the Red.
Cities are the source of civilization as the word itself shows. Every great civilization has a great city at its center.
Burn down your cities and leave our farms, and your cities will spring up again as if by magic; but destroy our farms and the grass will grow in the streets of every city in the country.William Jennings Bryan