Do you mean, rather, four Toraiz modules? I would think a Prophet-2 would make more sense, which would be two Toraiz units under one hood and with a keyboard added. This could be much like the Oberheim Two-Voice, with an option for either two-voice use or one voice having four oscillators; add a dedicated vibrato LFO, and one of the main shortcomings of the P-6 would be overcome.
I agree; even though times are vastly different, it still seems possible that Dave could follow the old Prophet '08 routine of extracting smaller iterations of either the Prophet-6 or the Rev2. I would love to see that.