This is a great idea but is far too logical for the average Democrat to understand and far too scary to Democrats elites who value power above everything else.
Voting is far more dangerous than firearms, in aggregate. Not even close. I’ve pointed this out on several occasions, and you’re right - they don’t like the idea, because it leads to an inescapable conclusion.
This is why liberals in recent years have resorted to the equivalent of sticking their fingers in their ears and yelling “la la la la la la”; they simply cannot operate in the realm of facts, logic, or reason. Therefore they have taken the next step, that is to shut down any discussion or debate or civilized discourse at all.