Automatic stations now use Pactor 3 to convey messages at 2700 bps. Yes, you could develop a 2800 hertz wide mode that works with most HF transceivers and delivers 75 bps -- but no network of automatic stations that provide message delivery would switch to a mode that slow, especially given their investment in Pactor 3 modems. The question is, with the 300 baud symbol rate limit intact but no bandwidth limit except that imposed by typical HF transceivers, can you design a mode that delivers significantly better throughput than 2700 bps? The answer is clearly "no". If it were technically and economically practical, WinLink would be using it. Even though there's now no regulatory bandwidth limit, for automatic stations, the 300 baud symbol rate limit combined with the electrical characteristics of most HF transceiver passbands yields a de facto 2200 hertz bandwidth limit. By removing the 300 baud symbol rate limit, the ARRL petition if adopted will eliminate this practical 2200 hertz bandwidth limit for automatic stations. Automatic stations would instead be limited by the proposed new 2800 hertz regulatory maximum. Automatic stations without busy frequency detectors would thus generate more interference than they do today.