There is definitely an increase in Ohio. I started an education and support group for pregnant women and new moms (daraluznetwork.com), so even though they don't always contact me about midwifery, I get contacted regularly through Dar a Luz Network.
Part of it is that women are so incredibly disillusioned with the medical model of birthing. Here in Ohio, it is almost impossible to have a VBAC in hospital, and the intervention rate makes having anything like a birth on your own terms a huge fight most of the time. Another part of the issue is that homebirth midwifery is illegal in this state and homebirth midwives are being hunted down and prosecuted here. Therefore, it is difficult to connect with a trained homebirth midwife. And, if you can accomplish that, there is always the expense of paying out-of-pocket for midwifery services since insurance doesn't cover any of it.
And, of course, there is just the fact that "freebirthing" is getting so much more press lately. It is a "movement" and there are as many reasons for choosing it as there are women. It seems to me like the opposite extreme to a planned c-section.
That's my two cents from the strange state of Ohio.