Sorry dad, you have an obligation to your children. However, you should be getting your financial aid information now. The kids should be applying for scholarships and work study. They may have to go to community colleges or state universities, where costs are lower. They are also responsible for their education and part of their salaries should be set aside for college. If they aren't working, then they should be.
Most parents don't question their kids well being over their own, so I'm not sure where you are coming from but you really come off cold hearted. I believe you have a responsibility to request that your kids do their part, and frankly they will get more out of it if they do, but how you can consider your retirement or their education is beyond me.
Mom of twin daughters, age 24, both college grads and both in grad school.