What are the tasks involved in this Mission?
Let’s create a new Section of the forum that is viewable to almost everybody with only few users who can post into this section. The few selected users who can post in this newly created section of the forum would be Merit Sources and few trusted members of this forum. <snip>
Ummm....no. This wouldn't work for several reasons I can think of and probably many more that I can't think of. "Trusted members" are sometimes not the best posters, and some aren't even active anymore. DT members aren't an organized group and some of them don't even get along with each other, much less have the same opinions on what good posts are--and some DT members don't even write interesting posts themselves.
Neither merit sources nor DT members get paid for being either one of those things. Frankly as a merit source and a DT member, I'm not willing to do any more work to help the forum improve when Theymos won't implement some of the really good suggestions that wouldn't require more work for people like the above who don't get paid, nor for staff members who
do get paid.
In my brutally honest opinion, OP hasn't been around here long enough to realize how unrealistic his proposal sounds.