I don't know. Roblox isn't like, the Grateful Dead, the Super Mario of our time. It's hard not to sound like an ass, but its games will feel as culturally irrelevant today as all but one or two Warcraft 3 Custom Maps feel today. Trust me, you're not wrong, it's idiotic.
I started playing Roblox back in 2009 as a 10 year old. I think you're wrong; to this day I still remember spending time in skateparks and Heli-Wars and Person299's Minigames. Not all of those games are around anymore but the playerbase still remembers them. In particular I remember playing Arsenal in early freshmen year of high school, only to find out that it became one of the largest games on the platform by the time I checked back in on Roblox my senior year of college.
None of us spent all of our money as kids on things that still feel culturally relevant today. It's not an interesting metric.
That said, there are games my son's circle of friends have kept coming back to longer than pretty much all games I played as a kid. I think you seriously underestimate the stickiness of the platform.
