The key to avoid decision-making on Wikipedia being taken over by single-interest groups is to ensure wide-ranging and continued participation by a reasonable number of independent editors with new voices being added to the mix to avoid ossification stagnation. At various times, one or the other person will drive an initiative, and some will voice concerns about short-term and long-term issues, but overall, as long as the atmosphere doesn't drive people away, things will get done. If things aren't getting done, they should be identified and something done about them, but problems won't get solved if people walk away from them.
Carcharoth
Any culture is a function of the people participating in that culture, and the only way to change the culture is to change the people in it. We need a critical mass of mature, knowledgeable editors; people who participate because they are knowledgeable, and not because they have strong opinions.
The next ten years of Wikipedia should be about multiplying the number of real-life scholars and experts participating. The Ambassadors program is a good start. Once the demographics change, the rest will follow; and until the demographics change, all the talking will avail nothing.
Andreas (Jayen466)