I'd also add (or inquire) what the benchmark even is for a black actress (or actor) tryna capitalize off the success of a hot tv character? Which isn't to say her team couldn't have done better but that it likely would've been an uphill battle regardless.
I never watched Empire but i did watch the first couple seasons of it's premium channel equivalent (as far as popularity) in Power, and of the four actors who became overnight pop culture sensations as Ghost, Tommy, Tasha, and Angela... none of their IMDBs are exactly scorching since. Naturi is essentially out of sight out of mind in the mainstream, outside of playing Tasha. Omar Hardwick is probably the best of them, and he just shows up on the occasional Netflix movie as 3rd billing.
And giving that he's 49 years old, that's probably his ceiling; he's not getting picked over Michael B Jordan, Damson Idris, John David Washington, etc for big movies. or Daniel Kaluyaa, LaKeith, etc for more serious/artsy films. Given that Taraji is in her early 50s, whatever limited roles Hollywood provides for old(er) black women, they gon just give to Viola Davis or Angela Basset.