you can certainly make weird sounds with existing synths, but interpolating rhythmic sound with a harmonic sound is different to me in that the resulting thing is more rooted in a musical context and can work with other non-neural elements more easily.
for example, once you get some sort of intuition for how sounds might meld, you could compose a "beat" made up of samples (maybe drum sounds, maybe not) in the "left" side that is tailored to interact in certain ways against the "right" (i'm referencing the UI in the abelton video).
people might trade their "seed" sounds, or they might keep them close to the vest!
probably you could use max msp to do stuff like this already but i'm imagining that the "left" sound itself being thought of like an intuitive signal processing algorithm.
it's like second order sampling. you can find pieces of audio and, rather than use them directly, as today, you can create a third sound that probably can't be deconstructed back to the original.
might not birth a top-level genre like sampling did hip hop, but i think once someone puts it together the right way, and once processing power allows them to go beyond some the limitations described, it will really open some new avenues