No, the adoption industry is a billion dollar business and it still will be...
Just because there might be more babies born, doesn't necessarily mean there will be more available for adoption.
There's a lot more resources available for women in the modern era to be able to keep and parent their babies than there was in years past.
Parents who choose adoption and abortion often do so for similar reasons. Young, broke and scared and not all of them are young or even broke. Mother's don't place their babies for adoption because they don't want them, they place them because they don't feel they can adequately provide for them and parent them. Some are in abusive situations and some are cases of rape who didn't choose abortion.
To show that not all parents who place their child(ren) for adoption are young and broke.. my grandma was adopted as a newborn, her parents were married and well off. They could afford to provide well for her. They were each previously married and each had 1 child already that were being raised by grandparents. They had her, placed her for adoption and then had 4 more kids they did parent. She met them as a young adult again and they were part of her life after that and the reason that they gave her was that at the time she was born, they hadn't been married for 9 months yet and at the time that was quite frowned on by society.
If anything here's where we will see increases:
Kids in foster care. There's already a shortage of foster parents, nationwide. This will increase the shortage.
Women dying from trying to perform an abortion their self.
Babies dying or being severely damaged from women trying to abort them their self.
This abortion movement is setting back women's rights 50 years. Abortion isn't the right choice for me specifically, but that doesn't mean it's not for someone else.