That's still essentially single digit percentages. And if is really in the low double digits, you're back to single digits when you go to 80 cores.
On the positive side, I don't think multi-user systems would be where they are today if we hadn't been staring at a future full of hardware that can only be fully utilized by embarrassingly parallel tasks.
Plus you get way more thermal room.
Plus you can disable SMT.
And there is always more than 1 process running if you take into account kernel threads.
So I would say way quite a lot more than 2%. More like 10%.