Basically from what I have been able to find, a lot of the issues the f-111 had during the later part of its development (about 1965 to 1972 if my sources are correct) came from the sho horning in of the navy fighter element and the fundamentally unsuited disine chosen because of the fighter requirement. So what if the air force bomber and the navy intersepter weren't united, when would this new bomber inter service. I've seen estimates for 1965 but that seems a bit fast (tsr2 wich basically had basiclly the same requirements started in 58, the usaf didn't start until 60, then again the tfx did fly befor the tsr2 anyway so maybe).