Please understand that what you call "Social Democracy" is Market Socialism. If you use the term "Market Socialism," everyone will understand what you are talking about. If you use "Social Democracy," everyone will understand it as "Capitalism with robust safety nets." These terms have long and historied uses, and that's why using them correctly is the best way to talk to people. Not to reinvent terms.
Black Americans did not recieve the right to vote electorally, but after violent struggle and civil unrest. My broader point is that enacting change is not truly possible electorally, it must come from outside pressure.
Women got the right to vote with mass civil unrest.
Abolishing the electoral college? Great. Making democracy more direct? Great. How do you practically see getting this accomplished? This is the crux of my point. Theory is nothing without practice, and practice is nothing without theory. Right now, you are arguing for utopianism, something that has failed numerous times. You cannot simply ask the ruling class to do better.
That is why theory is important! It guides your practice and makes it sharper.