I don’t think you understand how politics and elections work.
If people on the flanks give their voting power to “Blue (or Red) no matter who”, you end up with the Clintons and Bushes of the world. Parties have no incentive to actually do anything for their flanks.
When people on the flanks leverage their voting power effectively, you get MAGA and Justice Democrats.
Anyway, hope you learned something today. Otherwise, hope you have a nice day.
That would be more in line with the actual American tradition.
But personally, I would recommend to only allow filibusters in the House, which has a more proportional representation, and to not allow it in the Senate, which has the least proportional representation, even less than the electoral college.