We now experience fierce competition between different concepts:-sliding on the surface - planing hulls and boats_ foiling on under water wing.-sail, blade like wing or kite to power.
But what could be ultimate sailing craft the could beat all those in next 30-50 years from now ? In may imagination that will be combination of kite and reverse foil.Kite will provide unlimited force which can no longer be possible to control by weight and gravity force.The only way is wing like foil design now to pull down not up.

I can imagine the sailor or kiter will be hanging comfortably in the seat 3 or 5 meters above the water level. Foil in the water will be remotely operated to keep exact optimal depth all the time. Powerful kite above at surface well above what is possible today to control.In fact this future kite most likely looks like a rigid blade or wing for future aerodynamic efficiency.

Now if somebody live long enough or could check in next 30 years if my prognosis was right.