There are presently a lot of elite athletes who are carrying extra body fat, especially among NFL players. This doesn't mean that an overweight offensive lineman can't be good, because they are VERY good when they make it to that level.
So, yes, I do believe that it's more culturally acceptable to carry extra pounds now. But I believe this acceptance may be more prevalent among individuals in the lower economic strata. Presumably, when you are affluent, you are more educated, and you can afford to research and obtain the highest quality and freshest foods to nourish your body. If you're doing it right, this usually leads to a desirable body weight. Presently, I'm at a weight I last saw during the 1990's, and it's all due to a much improved diet.
I have hubbed before on my feelings about lower body fat percentages for women. I personally don't like that look for myself, because I see it as unfeminine. The good thing is that, as a whole, the vast majority of men have fairly wide-ranging tastes in what they consider attractive in a female body shape.
There is plenty of room for both the super-fit female, as well as those carrying a higher body fat percentage.
And, yes, young girls will see supermodels and good-looking actresses, to this day, as the ideal. Not that they're going to do anything about it, you understand, because it requires a certain amount of self-denial and discipline to stay that way, unless you happen to be blessed with fantastic genes.
I do agree that some of the supermodels are not as fit as they look. Much can be done with good lighting, and with still photography, there's always Photoshop!