The DNC could have passed ballot and electoral reform under Obama when they had good majorities in both the house an senate, but they will not be able to in the foreseeable future (because they likely will not have strong majorities in both chambers for a very long time). I do agree that they probably wouldn't, even if they could, unless the party changes drastically.
I do have (a tiny amount of) hope that "progressives" can gradually change the party. The Republican party has changed quite a bit over the last few decades; neocon under Bush, Tea Party under Obama, and now MAGA. So, it's definitely possible to change a party.