What I would personally like to see would be a variation of the body mounted kinematic coupler system, that perhaps uses the kadee mounts. So you would have the prototypical mounting and close coupling of body mount, but the coupler could expand outward and left and right to allow for tighter radii.
Just to follow up with my earlier posts where I defended the new trucks: I agree that the couplers are an issue. I think it more QC than the design, though the design could use some adjustments for sure. The new trucks I'm totally fine with (provided, again, that the QC related to the paint flaking is addressed, though I haven't seen this issue myself). The plastic crossmember between the two side frames I'm finding I actually prefer, and it does reduce the track noise slightly (just tested this, yesterday). The plastic used is thick enough that I have doubts it will ever cause an issues, and of course there's no fear of zinc rot.