Active Merit sources can't make up for inactive sources, so the inactive users should be replaced.
For what? So that new merit sources to the same users throw their merit? The current sources have already raised the rates for evaluating posts, it is already rare that anyone throws 1 merit per post, at least 2, 4, or even more. What problems will new merit sources solve? None.
It makes no sense to change inactive sources to active ones so that they just exist.
New merit sources should give preference to the good quality posts no matter who made it, if Theymos made any changes in the merit sources lists. Even if theymos is not interested in adding new sources, its better to reallocate some since some merit sources have very few smerits to spend from their source which was even less than 100 for some.