I believe more people are utilizing surrogacy but I wouldn't call it a growing market. I think most women want to carry their own children, but there are a few who don't or can't for medical reasons. It is these cases that make surrogacy a possibility, but I do not think it is something that will become common.
Over the past decade, there has been a noticeable up surge in the number of couples who have been looking to have a child using surrogacy. This perhaps comes as no surprise to people looking at the growing variety of couples and the older age of couples looking to have children now.
Yes, surrogacy is definitely a growing market. Not so long ago people raised their eyebrows when they heard about a woman carrying a child for another couple. Today you hear of more and more couples who have children born by surrogates. Couples who desperately want a child usually offer liberal compensation for surrogate services. This fee alone could prompt a woman to consider becoming a surrogate.
Surrogacy is not a growing market. Not that there's not a demand for it. There is. I just don't think it's a demand that's increasing. There's a certain "ick" factor that most men and women have to the idea of renting out a womb from which to harvest their child.