This question assumes a fact not in evidence, and it uses a term, "permissive," that we might not all agree upon. What does it mean to be "permissive," or "too permissive"? Can we agree that parents are more permissive than they used to be? If so, is that too permissive?
One example that comes to mind is spanking. Are parents too permissive if they do not spank their children? Is it too permissive or just plain common sense to not model behavior, hitting, which you do not want your children to engage in?
Another example is control. Is it permissive to allow children to decide what to wear to school, or is it a good way to help them learn how to make decisions for themselves and learn about the consequences of those decisions. A family is not a complete democracy, to be sure, but in areas in which children can make some fairly low-risk choices, is it too permissive to allow them to do so?
I am 61 years old, and apparently, I was raised in a permissive household, à la Dr. Spock. My brother and I were never spanked, were entitled to express our opinions about things, allowed to make our own choices, and so far, we both seem to be sound citizens, married, employed, with our own children raised in exactly the same way.
Is the behavior of some children (and adults) appalling? Of course it is! But there are so many other changes in our world today, a paucity of two-parent families, children having children, mass media that broadcast the misbehavior of celebrities around the world in one second flat, a greater gap between the haves and have-nots, and plenty more. If we are permissive, or too permissive, that might be the least of our problems.