The only ones that could cause change needed to reform their representation in the political system is the people. The incumbents have no incentive to do it.
That said, it doesn't seem to me that reform has been meaningfully attempted yet. It isn't reasonable to blame the establishment for blocking a reform that never got organized to begin with.
Presumably if there were concrete proposals with broad popular support intended to fix lobbying, gerrymandering, first past the post, and the information environment in general then we should see them implemented at the state level here and there. But we don't.
I believe it goes all the way back to the founding of the country. Gridlock was viewed as preferable to tyranny. Failure to arrive at a compromise is supposed to mean that no one gets to proceed.
Of course times change and cracks show up in the system.