Any sort of reform that would successfully get money out of politics would require a constitutional amendment. I have little faith that the current Congress would pass any sort of amendment that would eliminate the system they benefit from unless there was at least a reasonable possibility that the states would call for an Article V convention, but the state legislatures also benefit from the current corrupt system so I don't see this happening either. You can't wholesale replace Congress either because the lack of term limits and the staggered terms means that the special interest groups that benefit from corruption will try to primary candidates before you can build up a critical mass (see what happened to Jamaal Bowman and Cori Bush).