I would be willing to bet the next OB will have a 4 banger Turbo option instead of the six. The FB 2.5 and 2.0 will get DI. I would hope Subaru could squeeze another 10 HP and 10 LBS of TQ from the 2.5 and the 2.0 that really needs more oomph.
There will always be a thin line between HP and cost of added items like Turbos in all the auto makers line up.
There are lots of very good reasons people will go to great lengths to avoid a turbo engine for their particular vehicle need. As such all Auto makers need to offer a functional vehicle which can get the job done that does not rely on turbo tech. Having said that even just DI tech added to the 2.5 and boosting the HP to 185hp would be a very big improvement to the OB and even other models in Subarus line up with very little impact on mileage.
Or the age old trick of low boost turbos which more or less have a longer life and might allow the company to tune an engine to offer enough performance difference to attract people without suffering a big impact on reliability. Chrysler not long ago learned this one the hard way nearly every offering as sold with turbo power. LOL
It can be done the right way for the right use - or the wrong way for the wrong use and be a big failure. Turbo 4banger minivan? REALLY LOL Thanks Chrysler
One thing is for sure once fleet mileage impacts automakers set by the GOV of course the large engines will fade into history. 3.6L engine is a big engine when you consider that Mercedes has a 6000lb 7 passenger vehicle rated to tow over 7000lbs that comes in a 3.2L CDI engine putting out around 340hp. Not to mention more or less matches the 3.6 OB in mileage.