not only merit is already very hard to get, but it also freeze a lot of accounts into their current levels.
a lot of members that were a few points away from being "full member" are now frozen into "member" for a few months if not a few years.
a lot of jr members, newbies etc....
the merit system is like "ok, your a new to the game ? ok then f**k you, you just had to be here earlier."
proposing a merit jail is just like trying to stop a fire using oil. good luck.
if such jail were to exist, people would eventually move to some other forum.
twitter already have put a serious blow to bitcointalk.org in terms of crypo-related traffic ratio (%).
you certainly don't want this forum to lose the edge isn't it ?