OP, I respect your idea but I'd much prefer we bring back the actual newbie jail instead. Maybe restrict noobs to a section where they can't get paid for running a signature, can't earn merit, or both. Maybe have their exit from said jail contingent upon activity or something like that, I don't know.
The real problem is that there are too many accounts being registered, and they begin spamming from day one--and then they start getting paid for it as soon as they rank up to Jr. Member and can join one of these god-awful altcoin bounties.
Either way, it would be great if we could at least try something even if it's not perfect. Then at least we'd know if it works.
Wouldn't it be better if they could still earn merits while they are restriceted to a certain section? Then it would be a great idea if there would be enough merit sources that is focused on that section only. If their exit on jail will be based upon reaching a specific activity then all they have to do is to wait it up until their acquired the required number of activity right? It will still be the same but if it would be merit based, they will never have the chance to get out of that section to spam in other boards like they usually do.