Take it for what you will, a drop in the abortion rate is good news for pretty much everybody.
The key here is that they're looking at abortion rate, not just abortions which might decline simply because we have an aging population. What "rate" means is that there are fewer abortions per the number of women of child-bearing age.
Excellent new, really. It means, one way or another, that sex education is slowly but surely doing its job. Women and men, and even boys and girls, are being more responsible with their bodies.
Are there too many unwanted pregnancies still? Yes, of course there are. A lot of them could be prevented in the first place with better and more thorough education, but at least this tells us that we are going in the right direction.