First up, the above-mentioned Red-eye Gravy (https://en.wikipedia.org/wiki/Red-eye_gravy) may contain coffee, which is an abomination in any dish.
Second, in many parts of the world (UK, NZ) we expect our gravy to be somewhat stronger flavoured than the US seem to like it. I have had some pretty tasteless "gravy", so the addition of stronger flavour components (bacon grease, cheese, onion, garlic etc) would be welcome, to get that real strong taste.
In other words, I like the concept, but I'd rather execute it myself. With good fluffy biscuits/scones/dumplings or over fried potato/hash browns, it is pretty yummy after a hard night.