If my ex-husband petitions for his parental rights to be voided, will he still be liable to pay support?

My ex husband and I were married in July of 2000. Our daughter by marriage was born 2007. We dissolved our marriage in 2008 and final divorce decree 2010. I have had sole legal/physical custody of her since he was a baby. Now 7 years later he wants to petition to have his rights voided. Problem is I was severely dependent on my husbands income when married and only just recently completed college and got a full-time job. Child support is greatly needed and appreciated to continue her way of life. Normally, I would let the custody agreement stand but my husband would very much like to adopt her. I need to know if I can write a petition pro-se that is conditional that his rights be terminated but he remain financially responsible.