I would be more convinced if there were some attempt to fix the situation with resigning independents, as that is in fact an actual problem to be solved and one where the House (including myself) collectively faceplanted the last time we had this debate, but judging by his advocacy this does not appear to be a problem for the sponsor.
A potential solution for the Independent Senator problem could be to adopt a France-type system where the candidate names a substitute who would take their place in case the Independent prematurely leaves office. I would envision the system as having the Independent name their substitute before the election is held, though obviously there are alternative methods that exist for naming such a substitute. If there was support for such a system here in the Senate, I would be willing to introduce an alternative amendment to the floor to accomplish such an aim.