As everything PowerGlove does, this is a very thoughtful approach to introducing a possible improvement to the forum. I don't think encouraging a user to earn 1 merit for every 10 posts is too much to ask.

Let's say a post-merit system introduction user just earned their 1000th merit and became a Legendary. They have to earn 1 merit in the next 10 posts to maintain that rank. If they don't do this and drop to Hero, they can go 5000 meritless posts before they are deranked to Senior Member. However, if they earn >1 merit for every 10 posts, they'll be bumped back up to Legendary. Which I think is fair.

I can see how this would help prevent mindless posting.

A bit off-topic but for next year's April Fool's day, I would like to see the introduction of "merit zapping," where you can spend 10 sMerits to remove 1 merit from any user's profile. That would be fun. Lol.