I still don't see that it makes a difference. If it's so easy, why not just get it that way? Saying "this is too easy, therefore give me another easy way in" isn't any better an alternative.
I don't think I've ever seen anyone clear Ifrit normal 1,000 times with the express purpose of getting mentor - if that really is a thing then... god almighty, go away >,>
What I'd totally get behind is a mentor voting system... If enough sprouts vote you as helpful, you get to keep your status and maybe even a reward along the way.
If on the other hand, by the end of a given month you have less than X... maybe revoke it? And have a down-voting system to punish mentors who give the title a bad name (like the red-mage on another thread posted on this very forum).
I just can't see myself agreeing with giving people yet another easy way in. Plus, even then would the developers care enough to implement? Pvp has never been a very big scene in this mmorpg, if this was such a big issue people would have been in uproar since the mentor system had been implemented - which they haven't.