The cool thing is that if you believe in Marxism there never was room for change in that system because the base (what we can possibly make and who decides what to make) determines the superstructure (culture).
You're simply complaining about the change in strategy of selling cultural commodities, something that you never had a say in.
It's a capitalist solution to a capitalist problem - the problem of accessing the wholesale pipeline. It's obviously not this anymore anyway, but that's what the membership is for. You're buying at the "convenience store" level, but without the volume that's what the membership makes up for. Using Costco as your distributer is still a thing in rural areas, esp in Washington. Last time I was near Mt. Rainer there was a convenience store in the town that was clearly breaking up Costco packs, but they were like 1 of 3 places you could actually buy stuff.