I don't really think so.
I agree that the mental load of new things will go down over time, typically.
But that only works to a point. When it gets to a place where you actually need to be paying attention to too many things at once, it's not going to go down, or not much.
I think some of the changes I'm seeing over the past few years to infrastructure are creating that kind of situation. It's like the people designing them assume that they can make things more complex infinitely, and people will just adjust.
I also think that in some of them, it's actually impossible for any driver to be properly safe - they are always sacrificing one thing to another. It's not physically possible to look at more than one thing at a time.
It also ignores the fact that there will always be quite a few people who are not driving in these areas regularly, so are not experienced. You can't design roads so that anyone who isn't an experienced driver is at significant risk of making an error.
Which brings me to another trend I hate among traffic people these days - painting wonky crossings and political slogans on the road and other stupid things that are not standardized.