Certainly the promise of 2 cycle DI motors was low emissions, and 4 cycle outboard technology was unusual and therefore unproven. I think this created a market for 2 cycle DI outboard motors.
At this point, with 4 cycle OB motors having been around for a decade plus, those disadvantages have largely disappeared. Will we see large 4 cycle OBs that are 30 years old, as we routinely do with carb 2 cycle OBs? In my mind the jury is still out.
I do not see large 4 cycle motors older than 10 years, however, my sample size is my waterfront neighborhood.
I know of 2 guys that run 150 - 200HP 2 cycle DI OBs, and a few that run older carb 150HP 2 cycle OBs (like me). The rest have those 4 cycle Yammys from 150-300HP. One neighbor has twin 225 Tohatso 4 cycle motors, to replace his original Merc 225HP 4 cycle motors. The Mercs lasted 10 years, and he had no idea what was wrong with them so he replaced them for $40K.
It seems like Americans simply do not like 2 cycle engines. Everything that can go to 4 cycle or electric seems to go that way. Electric lawnmowers and chainsaws claim to out power gasoline versions.
Off topic for sure. Still a question why BRP is going with 2 cycle DI motors.