Hi B61,
To be fair I don't think the problem is the contribution from non-flyers.
The problem by the sound of things is that the people who are contributing are experts in very little.
Perfect example is what me and Phil were talking about above.
Part of the reason the theoretical part of the syllabus is in a bit of a pickle is because only aviators are contributing to its development (in the UK at least).
But aviators typically have no teaching experience whatsoever.
It strikes me that being a flyer may make one conversant with the current situation (whatever it is), but not necessarily better placed to offer solutions compared with anybody else.
Just my opinion