(I both laugh and shudder at the thought of the Prohibition Party participating in a debate), just the serious ones.
I agree, John. The problem is, I strongly suspect the Prohibition Party candidates will disagree with your assertion that they are not "serious" candidates. This is the problem I have with such notions of opening up the debates. Unless there are some restrictions put on, then it will have to be open to every candidate (Prohibition, Green, Libertarian, Reform, Constitution, Socialist, etc, etc, etc). We'll end up with 20+ people on stage and time enough for one or two questions each. Completely ineffective.
I agree that our political structure is one that makes third party candidacies more difficult than they should be. You're goal is a worthy one... making the process more open. For sure, my personal views are not represented by either the Dems or the Reps (I'm closest to Libertarian, but even they are "off" on some of my views... and there is way too much single issue concentration among Libertarians right now - on gun rights, which I am strongly in favor of, but this focus is drawing some social anti-Libertarians into the fold). However, the place to try to "fix" the process is not at the Presidential debates level.
Chaos would ensure