I will start with the fact that you're not telling anything new. However, you seem to be missing a (small?) detail: merit sources have most probably read this, in a way or another already; those who are not merit sources most probably deplete their merit too fast to be meaningful "in the grand scheme of things".

If the background for this is that some want to earn more merit and it hurts when others receive theirs "too easy", I think that the solution may be a way to have as merit sources those who [1] spend a lot time here and also [2] read a huge amount of posts. Of course, point [2] is very difficult to quantify/prove, hence I have no better solution than what the forum already has.

So I'd suggest you focus on coming with good and fresh ideas