This game, and it's engine, are developed for the future.
Afaik OM has a history with that, remember IL2-Sturmovik in 2001 and it's needs concerning computer power?
I think there are so many nuggets hidden in the code that high-end pc's in 5 years are still getting shown their limits.
So, on a regular med to lower high-end pc today you will to have balance playability with eye-candy.
I really dont think that even the reduced eye-candy will disappoint anybody except maybe Tree_UK
.