It won’t downsize just because of drivers, though there are quite a lot these days who don’t take as much pride in their job as in past. Times are changing. Transportation is changing. Fed Ex and UPS deliver pretty much all my purchases these days, except groceries. As the world becomes more energy concious, transportation of all sorts will see changes. Like I said, the changes won’t be overnight, but they are coming. OTR will become mostly local. The truckers will be needing to keep their noses clean. I will be glad to see the ones who ignore safety and courtesy go. I had to travel across ⅔ of the country a couple of years ago. I used to make such trips more often. This time I was terrorized through two states by truckers. At first I thought it was because I was driving a rickety old panel truck and afraid to drive faster than the limit. After a while though, I realized they were just doing it to anybody. People in cars forced to the shoulder, RVs boxed in, trucks driving in a pack using all lanes, forcing people to speed or pull off. If I had a gun with me I would have really come unglued on somebody. There are a lot of truck drivers out there doing damage to the reputation of freight haulers.
You are probably one of the drivers like my dad, dedicated and skilled. It made him kooky sometimes, after enough decades doing it. There were times when he should have switched out to something else for a while. It is important to not forget you are not Highway God, and that other people are counting on you to keep your head.