There wouldn't be any "good ol' days" if things didn't change... although some of us might remember those "good ol' days" as being better than they really were. I know some people who complain about today's racing and wish for "the good ol' days" who forget that they complained during the same days that they now reminisce about being "the good ol' days"...
It's true that todays "stock cars" are far from representing anything we can buy at a dealership, but that has been true for decades. Nothing wrong with racing sports cars, and NASCAR has raced on road courses for a long time. No matter how "old school" I might think I am there is always somebody else who points out that they are "older school"...
Just my own opinion, but true racing fans still watch and support racing even when they're not completely satisfied with the product. I tolerate people's right to complain, but I don't like when they try to turn others away from racing. True fans decide what they like about racing (or not) based upon their own observations and not based upon what they think the crowd or some celebrity says. I've been disappointed in the Cup Series for several years, but I'm actually finding the current version more interesting and I've actually been watching races all the way through again.
If you don't like it, please go do something else instead of trying to tear it down for everybody else. Or offer some practical solutions instead of just gloom. Field sizes are 40 cars and several races are drawing fewer than that - there is room for people to demonstrate that they have better ideas...