Those of a certain age will remember “Eminence Front” from The Who. Its lyrics describe the illusion of fame, the faux importance of posers. Influencers, perhaps, although they weren’t called that back then.
In any case, there’s eminence meaning importance, having elevated status in one’s field, the quality of being eminent; and there’s imminence, the state of being imminent or about to happen (the imminence of war); and then there’s the one even fewer people know about, which is immanence. That one means existing as an inherent part of something, the quality of being immanent, and it appears most often, but not exclusively, in writings on religious ideology: the immanence of Spirit/God, for example. I include it here because it sounds very similar to both of the other two, not because I see it misused.
I see “eminent” and “imminent” far more often than “eminence” and “imminence,” for what that’s worth (exactly what you paid for it, honestly). That’s merely an observation, for which I offer no reference other than my own experience. (But if you wanted, you could try an Ngram search, maybe.)
Eminence can be a noun, too, referring to an individual possessing that elevated status. It appears in the phrase eminence grise: as such, it means what one might call “the power behind the throne.” One who wields power without having been granted authority. One who is able to control, through shadowy means (hence “gray”).
To answer my own question, I’d say the eminence front is far past imminent. It’s been here for years, now. (See my comment about influencers. No, I don’t have a high opinion of them in general.)