Should I give him ultimatum?

We have been married 22 years and have 2 children (18,20). We both work and make about the same amount of money. I only have a HS diploma and hubby just finished his MBA a couple years ago. My husband pays the mortgage, car payment, cable, phone, gas/electric. and a little of the grocery bills. I pay for water/sewer, car insurance(s), oil changes, majority of the grocery and emergencies money as needed for unplanned repairs or such. Keep telling him to get a better job and that he should be paying all of the bills. He says keeps applying and did look like was going to get a better job right before the economy tanked but they rescinded offer. People I work with agree that he should be paying all of the bills and should get a divorce like many of them are. Then he would have to pay me alimony and I would have all my pay for myself. Also I put away maximum amount for retirement at my work while he only puts in minimum at his work. I told him that he needs to get off his and get a better job or leaving. He tries to tell me that he is trying and does apply and looks every day but he needs to try harder. Also tries to tell me that my retirement is for us that's why he pays the larger bills so I can put more away for future. But friends tell me I would keep my retirement and he would get his and plus would have to pay me alimony. Have told hubby this hoping it would make him work harder at getting a better job rather then lose house and even more money in a divorce. Should I set a time frame with ultimatium?