The reason the new up-charge event is an issue is because:
1) Being in the park late used to be free to ALL guests - it was called "Standard Operating Hours".
2) Then it became exclusive to Resort Guests as EMH, or what (used to be) reasonably priced hard-ticket events (under $50) that featured swaths of unique entertainment as well.
3) Now, it's for those that pay an exorbitant amount of money.
We've been talking about the decline in value and the increase in prices at WDW for quite some time, but this is a whole new level of "wow they must have you-know-whats of steel" to think this was going to fly.
Considering that, even among hard-core fans like us, I have yet to see one person say they paid for this - the few that went were given free tickets - and the other reports, this one isn't long for the books, thankfully.
To bring it back around to the OP's thoughts of the haves and have-nots, the macro issue is that historically, if you could afford to visit WDW and get an admission ticket, everyone was on a pretty much level playing field when it came to what happened inside the gate. It didn't matter if you were wealthy or had to scrimp and save for years to come - once you were there, Mickey didn't care if you were staying at the Grand Floridian or a campsite off-property. Sure, some folks could afford to buy more crap to take home or more expensive meals, but the entertainment and attraction experience was a level playing field.
That is the true tragedy of MM+, and things like this that it has led to. That WDW now has a visible caste system, and are adding new things and making old things that were once accessible to all to now being put behind an increasingly crazy paywall.