I'm absolutely fine with the talking filibuster; I love it, and think we should do it. Killing it entirely? No.
Packing the court? Also no. If anything, I think that the size should be reduced. I'd be fine with term limits on judges (say, 16 years), along with a code of ethics and mandatory financial disclosures and recusals for conflicts of interest. But packing the court is not a good idea.
People think there’s a sense of fair play involved here and a dislike for hypocrisy, but it isn’t the case.
I think that if we're ever going to get back to a point where we aren't hyperpartisan, we need to operate in good faith, even if the other side isn't. Constantly escalating ends up hurting us in the long run. And, again - as soon as you create the tools to get your way, those tools will be used against you; a hammer doesn't care which ideologue is swinging it.
expand the cap on the house,
Bad idea. Getting 400+ people to stop arguing long enough to vote on a thing is already hard enough. You'd just be adding more layers of bullshit.
add states
Eh. Last I knew, PR didn't really want to be a state; I recall that under 50% of the island population wanted statehood. D.C. might, but I'm not sure that making a city a whole-ass state--particularly since most of the city is actually in Virginia and Maryland--is a good idea. That would have the effect of ensuring that voters in D.C. would be far more powerful than any other voters, since you would have a fairly small number of voters selecting two senators. (I can't find exact populatino data for D.C. alone; all population figures I can find are for metro D.C., which counts large parts of Virginia and Maryland; those voters already have representatives and senators.)
blow the electoral college
I oppose this for the same reason that I oppose getting rid of the Senate and going to a direct democracy; an electoral college balances the interests of the states as a whole against the population, because they're not always the same. An electoral system forces candidates to try and balance a message, rather than focusing solely on the most populous areas. Rather than eliminating the electoral college, I'd rather see some form of ranked-choice voting, which would tend to eliminate candidates that had the most extremely unpopular platforms. (E.g., Trump consistently won about 30% of the votes in the 2015 primaries, but a strong majority of voters would have selected him as their last choice. Some form of ranked choice in the Republican primaries likely would have resulted in a candidate like Jeb Bush or Marco Rubio instead of Trump.)
All of this is a balancing game of competing interests and priorities. Steamrolling people and hammering them isn't going to make anything better. Yes, I hear what you're saying about the Overton window, but frankly, that's a messaging problem that the left has created. If the right is able to move the Overton window, it's because the left is doing a really shitty job at meeting voters where they are, while the right is doing a damn good job at outreach.