I agree with Tony. If I am taking off after a 727-200 maxed out, and am in a light A-300, I am out climbing him and cannot see him with my pitch angle. There is too much going on during t/o roll, rotation and climb out to keep another acft of unknown performance in sight. I understand that you are attempting to help the company out with decreased departure spacing, but at this point in my career, I don't feel that it is my problem, and neither should you.
In my previous military career, we used to takeoff in heavies, with 12 second spacing. That part of my life is over.