You made a lot of great points about gentrification and the commodification of Black culture, but I just want to add to that another point about how the diversification of those at the top doesn't change the exploitation inherent in the capitalist system.
If the wealth of celebrities were simply a matter of commodifying their names and images, their wealth would be in my opinion, more or less earned and ethical.
But a lot of celebrities end up starting clothing lines, i.e. Fenty, and the textile industry is hands-down one of the most hyper-exploitative in the world that particularly preys on women and children of color.
The forerunners of intersectional feminism in the Combahee Collective had an international mindset. They didn't even use the phrase "women of color." They said "Third World women" instead to explicitly identify and show their solidarity with those subjects of colonialism.
But today, identity politics is becoming more commercialized and alienated from that tradition to where it's just another form of branding.
Like with Fenty, they get a lot of praise for celebrating different body types and the diversity of their models in their fashion shows, and they advertise that they have socially responsible sourcing (I'm doubtful), but if you go down to the bottom of their supply chain, you're gonna find women of color in sweatshops working for pennies an hour just like with every other clothing line.