Until very recently, California was polarized even more sharply than Washington DC, and seats were filled with ideological firebrands backed by primary voters who would punish "compromise". This chronic disunity meant we unable to use the power of our size effectively. But now that we're steadily replacing those folks with people who can safely operate together, our reps can safely ignore their parties to vote as a uniform block that only cares about itself. Coming from a state as big as California, that represents a major a threat. In another election cycle or two, California will have enough unity to become the swing vote on anything. And yes, you can expect it to use this power ruthlessly. Nothing will move unless there's something in it for California, and given the size and diversity of the state, it'll be a rare issue that passes without California extracting some major concession from the other States. It'll be all take and no give, all the time, on everything.
Power this substantial and unchecked will be deeply resented and increasingly abused. For other big states, the only way to stop the pain will be to start operating the same way themselves. Florida is well on its way to ending gerrymandering. Governor Cuomo is starting to make an issue of it in New York. If they can start operating as post-partisan blocks, they can work together to neutralize California's power. Once Texas and Illinois get into the game (in that order, I suspect), the political dynamic will be Big States vs. Small States Further Disadvantaged By Intractable Partisan Rifts. Applying pressure of this magnitude to what will be perennial losers should cause the whole sordid institution to collapse entirely, subordinating politicians to people rather than parties in all 50 States. In retrospect, the madness we're living through now will look a lot like the crime-ridden hell scape of New York City in the 70's, as seen from the 90's on.