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There's gotta be a point, or else they'll become the exact opposite of a recumbent.
Really though, seat tubes can only get so steep without the riders injuring their knees, and the longest bikes if reach continues will only be rideable by the tallest riders with greatest mobility.
I listened to an interview with a guy that demos Geometron, and he was saying that 62° head angle was the absolute slackest, and beyond that was unridable.
He did make an interesting observation about stem length, in that when you draw a line through the centre of your grips they should intersect the center of your steerer if your riding such a slack bike (presumable he had a Mojo Rising fork with 0mm offset), which explains why when I had a 35mm stem on my bike I didn’t like it, as I ride with the bars rolled back quite a bit the steering was negative.
Dogs
There must come a point where it has to stop though?
Certainly hope it's before 83/57 D: