Funny boats are just like fasion , it will always come back into style.
Alf Bullen and others always ran setbacks & out- riggers in the 70's "Slipstream" & "wicked alf" are two boats that spring to mind. There was then a trend to go back on to the transom for a fair number of years and here we are with setback & out-riggers again.
Let me take a stab at the next thing to happen............
Mounting back on the transom maybe
Edit: actually make that an inbuilt Hydraulic transom