And that's part of the same issue. The "mainstream" places of discussion aren't just unaware of the DeWitt / Alternate argument -- they DISAGREE with it -- and if they have their way, they will also SUPPRESS it, which is why it can only arise *outside* and not *within* or even *with the encouragement of* the "mainstream" circles.
I think it's great that there's an open, wide market (agora?) of ideas out there and that people are openly disagreeing with us. That's not a reason not to engage people. I WANT to hear their disagreements. I've written for Partially Examined Life. I wrote a chapter for "How to Live a Good Life", together with 14 other people whose views are all at odds with mine. I've never experienced this exposure as scary in any way whatsoever, on the contrary. Philodemus, if you read most of his scrolls, was REACTING against the views and writings of others (Theophrastus, the mathematicians, etc.). This is how philosophy advances and grows and gains relevance and a wider audience.
But if you do not participate in public discourse, you forfeit the right to lament that your views are excluded. So you SHOULD participate.