When I was in grad school at an Ivy League university in the early 80s, it was reported in the school paper that about 50% of undergraduates were legacies.
Yes. It was far easier to get into college in the '80s, in part because far fewer bothered to attend; this resulted in more legacies then than now (I believe the percentage of legacies at Harvard is in the single digits).
According to this article, 16% of the Harvard class of 2019 are legacies: http://features.thecrimson.com/2015/freshman-survey/makeup-n... (The survey was voluntary, and there is no mention of the percentage response. Apparently Harvard does not publish the actual number of legacies.)
So yes, things are better than in my day. I would say that the number of people who would not have bothered to attend Harvard in the 80's was very small indeed.
Has that changed?