A fully enclosed/sealed drivetrain would be nice but the tech doesn't exist yet. I don't mean just IGH but also fully enclosed power transmissions. No more exposed chain / drive shaft, perhaps, not even a chain.
The mainstream drivetrain tech that is fully exposed to the elements is just ridiculous in the 21st century. It discourages all-weather riding and a major inconvenience to daily commuters.
I think the weight weenies are to blame in this messed up priorities when they only make up a tiny minority of the riding populace. Don't mind a bit heavier bike as long as I can ride it in any weather without having to fiddle with it every time I get caught in few hours of heavy rain. And to be honest, I like actually like riding in the rain, any weather, even windy.
Just man-up, get faster, beat your buddies with training instead of counting on reducing your bike's weight.