I would be surprised if future OC is defined by ethnic boundaries.
At some point, it won't be. They don't call America a melting pot for nothing. Well, we're almost all melted now. And twenty years from now? Forget about it.
I'm assuming these guys that own construction companies/other legit holdings will at least hand them down to their kids.
And those will be the last of the LCN millionaires in those businesses, the kids who are inheriting them now. It's nearly impossible to get a startup construction company going today if you have mob ties.
The guys who are already settled will hand them down to their kids. Beyond that, it's dog eat dog.