I have a 50-50 placement goal?

I have a 14mo old son that is my life. His mother and i used to be engaged but we broke up a year ago. We will never be again and we dont see eye to eye. I hired a good Lawyer and took her to court 4 months ago on placement issues. I got tired of everything being under her roof on her terms just because she is the primary care taker. She is a very difficult person to deal with. Anyways...i was going to end up with the usual every other weekend time but that wasnt enuff time for me and my son to spend time together. I wanted a couple extra days during the week. I asked for placement times of Saturday through monday night then thursday nights for 2 hrs on my non weekends. Then i get him all day Monday following my non weekend. So i got what i wanted from the family court commissioner. My ex wasnt happy with it because she wanted me to have just the every other weekend but she did request mediation and thats not what i wanted. We went to mediation and agreed on a set schedule. It is only good for two years as court orders are. The mediator told us she STRONLY beleives that two parents of a child should reside in the same town. She also beleived that every other weekend with dads are not enough. She said fathers are very important in a childs life. I was happy to hear that from her. NOW my longterm goal is to establish 50-50 placement in 2-3 yrs. What are my chancs to getting this? I have a steady job. I been ontime with all child support. I have a good home. I dont drink, i dont do drugs, im not a criminal. So my history is good. Im a good father and thats all i want for my son. As for his mother, she works a steady job. BUT she tried to committ suicide in her past, three times doented by the state. Wisconsin that is. She comes from a very disfuntional family and encorporates yelling and screaming with herself and family. Thats one of the main reasons im not with her, didnt want my son to see or hear us fight. To say the least she had a very disfuntional past and doesnt mean she is cured for life. She struggles with a lot of mental issues and of depression really bad. She is also in major denial of this. Who ever she ends up with in the future THEY WILL fight and scream and i dont want my son around that. I want to take him away from that stuff as much as i can. I want to show my son peace and serenity not tension and chaos. What are my chances to establish this? She tells me it will never happen but of course she will tell me that. I will do whatever is nessessary to get my 50-50.