The Mathews comments are spot on. Both major parties should be exposed as actual minority parties as all partisan efforts are. Coalitions outside the winner take all dynamic are more legitemate.
This kind of political reform conversation must become aware of what it takes to survive and avoid being thrown under the bus as the next electoral cycle advances. That part is really really hard, that is movements for political reform, real representation, proportional representation get no support from careerists and those more adept thriving in a far less than ideal body politic.