It's true that class warfare was introduced in Hearth's Warming Eve, but it was not resolved since society is still very stratified.
I think the pegasi hold the key to either toppling or upholding the status quo. Their control of the weather gives them a unique status. Which side will they join? Do they join the uprising (at which point the 1% would be done for), or will they stand with the rulers for example by withholding rain so the crops fail, starving the 99% until the revolution is quelled?
I agree, they can't just replace one alicorn with another. The aim must be the abolishment of the monarchy in favor of a representative democracy with strict term limits (no more 1000+ year reigns of terror).
A revolution without Fluttershy is not a revolution worth having.

P.S.: You were obviously more lucky with YouTube comments than me; The only ones I saw that stuck in my mind were ones saying that "Super Speedy Cider Squeezy 6000" was about capitalism vs. communism (in the cold war capitalism good/communsim bad sense), and one saying that Fluttershy, Miss Altruism herself, was, of all things, an objectivist. The mind boggles.