I would say no, reason being that Hunter rep is relatively easy to get compared to protector rep, hero rep, corsair rep, bonecrusher rep, and defender of adan rep (all of which unlock mounts).

As for hunter mounts being called from an idol, I can see that happening somewhere around 37k or 81k hunter rep and the mount being weaker than a protector mount (say, about the strength of a green spiketail?).

It's not that easy with Hunter rep. You either have to buy the collection pieces or kill mobs and hope to track a beast. To create idols you need to buy the knowledge (scrolls) , then collect a certain number of completed collections, plus professions rep produce.
By having a mount that you can only summon occasionally, it's not detracting from people who want to buy a regular mount.

i) By having it weaker than a Hero or Bonecrusher mount you’re not devaluing those mounts.
ii) It means that non-pay players or player on low incomes can compete occasionally with those players that have spent money.
iii) Because it is hard to obtain it shouldn’t stop players wanting a regular mount or trying to achieve a better mount if they can afford one.
iv) It’s keep things interesting.

You're probably right though Marcus having it at the higher level rep might be better since the higher levels have the greater disparity in strength.
But I'd then like it to be nearly as strong as the equivalent level hero or bonecrusher mounts.

SIG,

Well, when I said easy, I meant that hunter collections cost less to complete than other reps collections for which you get mounts if you buy collection pieces off of AH.

That's why we don't have 7b mounts or gladiator mounts :P