<...> I don't know if that seems like a good idea to you but I could easily imagine a ratio for everyone and the day you drop below a certain point you can no longer post on the forum. And why not warning you a bit before so you know you MUST post only extremely high value content or you won't post anything anymore.
Back in October 2018, I calculated the merit per day, in order to get a general idea of how many people were keeping up with the 1 merit per day, which is sort of the equivalent of being able to rank-up without merit slowing one down. The number of people with or above the 1 merot per day ratio was of 109, which represented at the time 0,5% of all merited forum members (disregarding recently created accounts in order to avoid noise in the data).
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EarnedMeritPerDay nUsers %
[>=1] 109 0,50%
[0.75 ... 1) 49 0,22%
[0.5 ... 0.75) 128 0,58%
[0.25 ... 0.5) 432 1,97%
[0.1 ... 0.25) 1139 5,18%
[<0.1) 20114 91,55%
The main core of forum members earn an average per day lower than 0.1 merits. Restricting people from posting with low averages, be it on a per post or per day basis, would have very negative effects. To start with, only 25.809 people have received any merits at all.
That would mean that, all the rest of currently active posters have earned 0 merits per day (and per post), leaving the vast majority out from being able to post. There are also plenty of people who post sporadically and/or in boards that are not showered with merits, and who may well be decent content generators when they post.