Personally, my preferred solution to polarization is voting reform (I actually think approval voting would be a better fix than RCV though) but he makes a good point that voting reform is a long term solution to a short term problem. I still think it’s worth pursuing, but there’s no way it will help us with the 2024 presidential election, for example.
The Democratic Party moving to the center could be done much more quickly, and if the strategy was successful in winning elections, might force the Republican Party to similarly adopt more moderate positions.
Another “solution” to polarization in the US is a civil war. This should definitely be avoided at all costs, but would probably eventually reduce polarization when the winning side forces the losing side to adopt their policies (like how the North forced the South to end slavery after the Civil War).
Having a single party dominate politics for a while sounds a little scary, but if they’re democratically elected, I guess that’s what people want, right? And, to me, it’s a much more palatable short-term solution to polarization than Civil War II.