Perhaps it is: the usual retort is "just amend the Constitution", but that's like counseling someone who is poor to just plant a money tree.
There was an interesting study done a few years ago, that calculated that if every R voter switched residences with every D voter, and then ~7 million surplus D voters spread properly out amongst the remaining +R swing districts, then it would be impossible for the GOP to ever hold the presidency, ever have a majority in the Senate, and be net down 12-15 seats in the House in perpetuity (assuming 2020 voting levels). It's also possible to flip it around, and "pack" D voters into a handful of major cities in 15-20 states, and distribute the R voters equally amongst the other states in the right way, then R would be favored +7 for the presidency, retain 64 Senate seats, and have over 30 House seats. If memory serves the Presidency could be won by Democrats, but only if the popular vote margin approached 20 million people.
The same people, holding the same views, voting in nationwide election(s), with two polar opposite outcomes for the Presidency. If that's not a referendum on how we pick a President I don't know what is.