If you have been paying attention, you will notice that the DT system is already generating so much hates and dividing us as a Bitcoin community instead of uniting. This is because some DT members are being accused of abusing the system and using their powers for their personal vendetta.
Imagine adding a demerit system, that will bring nothing but chaos. I don't see it helping the forum or contributing in any way.
It can be distressing to new members reading some of the posts from old members who should be knowledgeable but unfortunately bland. The quality of reasoning (and posts) of many Legendary members is appalling. This could be due to the fact that they were promoted before the introduction of the merit system or they simply bought a high-ranked account to spew rubbish on the forum.
The forum have rules against spamming and if you notice anyone committing same, kindly use the report button and it will be handled by the admins.
With the rampancy of signature campaigns, the tendency for participants to type to meet quota (even if they don’t really make sense is high). This is why I think that a demotion (or demerit) button is appropriate. This would mitigate the preponderance of the disappointment in reading posts from some so-ranked Legendary sounding like it’s from a 12-year old.
It is up to the campaign managers to decide who is making quality post and who isn't and to remove the later because they have the right and power to do so. Signature campaigns are highly competitive and managers go for those they consider the best to add value to the business they were contracted to promote. I believe anyone still in any campaign meets the expectations of the manager and that should not be your concern.
A ranking system should reflect competence, integrity and credibility of those it is bestowed upon. Unfortunately, the BTT system should be stremlined and made balanced through the implementation of necessary trade-offs. A system that promotes but never demotes never gets the best of its men. Let’s make this happen
Too many rules will eventually kill the forum. I think we already have enough rules already so we don't need new and controversial one like you suggested.