A big part of the problem is that the people who are going to approve changing the election system are also often the people who are elected due to the flaws in this system, and would like to hang onto the power these positions give them.

It's as if if the power to accept patches on an OS belonged to people who were profiting from a bunch of zero-day exploits in it, and kept on DMCAing attempts to set up a new repo free of their influence.