While eliminating the electoral college is discussed quite a bit, getting an amendment passed to do so is a huge challenge. Doing so would be FAR from a "small change" -- it would significantly change the balance of power between the states so that small/thinly populated states essentially ceased to matter at all. It would also change the balance of power between the parties and between power bases within the parties.
Far more practical to get some kind of proportional allocation of the electoral votes (EVs) within every state. That moves in the direction of direct democracy and gives 3rd parties a chance of getting some EVs, but retains a balancing mechanism for the states. If you get a situation where a 3rd party (or some combination of 3rd parties) has 5-10% of the EVs, then they could become power brokers in many elections, demanding concessions to throw their votes to one of major parties. For instance, if the Dems had 255, Reps 255, and various 3rd parties had 28 between them, they could pick the winner. You might wind up with a Republican president with a Libertarian VP and a Constitutionalist AG or a Dem President with a Green VP and a socialist Secretary of Labor.
I, too, would think changing the senate is unlikely.
Frankly, I'd like to see us go to:
- 50 senators (1 per state, single 6-year term)
- 200 representatives (allocated per census, max two 2-year terms)
- President (single 4-year term)
- Judges (8-year limit at each level, district, appellate, supreme, etc)
- Proportional allocation of EVs
- No identification of party affiliation on ballots -- that helps the parties control who's running; it doesn't help the people choose good candidates
- The addition of a "None-of the-above" option on all ballots; if that beats out other candidates, then there's an immediate re-election (a couple weeks) and none of those candidates can run. So, if you have Hillary, Trump, Green X, Libertarian Y, etc and None-of-the-above wins, you'd have an immediate new election with Sanders, Cruz, Green X1, Lib Y1, etc.
- All seating in congress is done randomly, NOT by party affiliation. Perhaps they'd be more likely to work "across the aisle" on issues if there wasn't a physical aisle separating them.
Dissolving the electoral college is definitely possible it has been talked about a lot, it is only small change since we almost have a de facto direct voting system anyways.
Senate changing I find not very likely, it is to entrenched in the idea of dual sovereignty between the states and federal government.
The american system is purposely set up as a winner take all system, and it is in the major political parties best interest to keep it that way, a they pretty much dictate who is elected, so i do not think a constitutional amendment getting anywhere near enough votes in congress.
Maybe if a third party consistently started getting ten or twenty percent, and in a presidential election because of that there was no clear winner, and the electoral college decided the winner. If you could set up a scenario like that you might get your plural system and dissolution of the electoral college.
So maybe look for a political party that almost became a major contender and presidential elections where this new contender would of stopped any candidate from getting the majority required for election.