I used to ride a lot in a rough woods quite far away (10+km of asphalt roads) from home, making on average about 70+km per riding episode. The most convenient generic setup was "inflate the wide and grippy tires up to the limit (4 to 5 bars depending on vendor)" and off you go. It's much easier to ride with overinflated tires over asphalt and their grippiness was mostly sufficient for the most conditions in a woods. Regarding the stiffness - anyway you never ride on rough terrain sitting in a saddle, you just have to stay on peddles to maintain stability. As an added but valuable bonus - overinflated tires are much stronger to withstand puncture attemps (in fact, I can't even remember I had one for a few years back then).

So, I'm quite sceptical about that thing perspectives... I would prefer they invent more durable but cheap main components, btw, b/c that's just not right when a normal bike costs about as much as a car.