The last time this came up, the same thing was suggested. Someone brought up that whoever needed to verify the keys would eventually stop doing so unless the key verification process could be automated from beginning to end.

The argument was that the person who needed to verify the key wouldn't be bothered to actually verify. The key would be so commonplace that as long as a nonsensical string of characters appeared, the verifier would check the box using the it's-good-enough mentality. The crux is still the same: fool the human, get the goods.