The demographics (based on race, religion, registered voters, party membership, pretty much any way you want to dice it) allowing for population growth, are far more similar to 1980 than they are different.
Every year 2.48m (mostly white, majority R voting people) die and are replaced by 2.52m (majority non-white, heavily D voting people).
Unfortunately that probably won’t be changing, and may actually accelerate with the Obamacare Death Panels and unfettered immigration.