If the Husaberg proves to be a step forward,and it appears that this is the case the japanese will not hesitate to manufactur their own version of this design.
The stacked trans,clutch is now the norm on sport bikes.Horizontial cylinders have been with us since the 60"s.
What has made this combo work together is FI..they(Jap) have up to this point been adapting FI to old engines(off road) that were carbed..
What is old always seems to become new again...a few weeks ago at a Yamaha service school the Yamaha people where going on at great lenghs about the new cross plane crankshaft on the 09 R1..
All I could see was that someone found a way to adapt a 2T multi bottom end on a 4T top end