N.D.H.
The Japanese Factories have a serious case of that. Not Designed Here - and a million variations on that theme.
I'd say Yamaha have a s***load of 2t Tech just waiting to be used.
They've their DFI Outboards, so, they haven't given up on 2ts, besides still doing the YZs.
I hope to see them do their every "generation" kick to the teeth of the other manufacturers. Their last big one was the YZfs, so, I hope it may be 2ts.
With the others having given up (in public) on 2ts, it could be a massive, killer kick to their teeth from Yamaha.
Lets hope it's at least a bit innovative, like Uniflows ideas.
Yes, I do live in hope, but better that, than not.