Equally, there are limited hours in the day where those able to answer questions may be in a position to respond.
For my own part, I have a living to earn, students to teach, the various facets of my own IT business to run, one or three programming projects of my own on the go at any one time, I am also heavily involved with a metallurgy technical forum and, well, I imagine most other people are similary involved with their own life.
There are periods where this particluar forum enjoys a very healthy number of posts, and there are others when things go a bit quiet.
As long as there is a broad diversity of questions being asked I can't see any great problem, provided PC Advisor are prepared to continue to allow us the benefit of the WebDesign forum of course.
This is and probably always will be the place people come who want to learn about web design, but they invariably want to learn about it when they have a problem that needs resolution, or whent hey are just starting out.
Personally I don't see a problem with that formula. Perhaps I've somehow misunderstood you though.