If debate is not allowed, this will happen:
Q: "If the earth is flat, then there can be no gravity because it would crunch it up into a ball. What holds us down?"
Sceptimatic: "Denpressure caused by an ice dome holding the air in"
Jrowe: cannot make his post because it is debate against Sceptimatic's post.
ausGeoff: cannot make his post because it is also debate.
I don't think JRowe's post would be forbidden even under the current system, because it still qualifies as a flat earth answer. AusGeoff's certainly would be, but a) the less said from him, the better and b) so? The person making the post would have two whole forums available to them (debate and general) for criticizing ideas. They can learn of multiple conflicting theories, and learn of how FEers aswer certain questions, and I'd say that's a useful thing to have on the site.
As for whether or not they'd learn the theories are fundametally flawed, you're either going to get an intelligent person who'd spot initial issues with the answers, or someone who's already on the cusp of believing in FET and who won't really care what an REer has to say. Plus it's always possible for other posters to make threads dedicated to "Is there any evidence for aether?" etc.
If they then want to criticize those ideas, they can go ahead, elsewhere, but they'd need to actually know the answers first. There's nothing wrog with debate, but there's a time and a place.
Q&A's a nice idea in theory, for the purpose of newcomers etc who want only to learn about the theory, before criticizing it. It's a place to ask questions like, for example "What is responsible for gravity?" The current way REers invade with "Oh, there's no good answer because __, ___ and ____," is just stupid, because all it does is discourages FEers from posting, and newcomers don't get an answer, and leave (leaving us with only the idiots who are only here to yell at people, like LK).
If you want to ask something like "How does FET deny gravity after the Cavendish experiment?" or "How does FET explain varying gravity on the surface of the Earth?" etc, go to debate, because that's something meant to poke a hole in FET.
The point is, different questions have different purposes. Sometimes, people just aren't interested in blowing FET out of the water: or maybe they'd just like to understand what they're talking about before they do. Debate etc are still around for when people want to actively criticize FET, or ask after something they intend to debate. However, for those who'd rather understand an aspect of the theory without having a thread derailed (which happens often), a Q&A type section works.
The current section isn't well-defined enough for this to work, which is a problem, especially due to the lack of serious FEers, but the theory behind it is definitely worthwhile.
Personally I prefer the idea of altering the rule just so that you're not allowed to mention RET or anything outside the scope of what's being presented. Allows for some debate, but debate exclusively centred around FET. That would allow questions like "Is there evidence for aether?" and "How does denpressure work horizontally?" but no additions like "But the Cavendish experiment shows..." or "We observe changing levels of gravity," thus allowing for discussion, and so education, about FET, with less possibility for derailing.