I can't agree with this post more.
I'm not sure what SE is thinking, so that makes me a little wary.
I don't expect being able to completely switch over from (say) level 10 tank to level 10 healer will be easy. I wish it would be, but thinking along the lines of SE, I don't think that this will be the case since that would make all barding instantly accessible to anyone who leveled a chocobo only once. All they'd have to do is switch over to a new class.
As much as I wish they'd allow this, I don't see it happening. I fully expect them to implement the 'breeding' of chocobos this way. "Messed up? Want a new class? Raise a new chocobo!" I can't say that I like this idea- some of us didn't know what we were getting into when we allocated stats to more than one role.
The fact that I might be leveling my chocobo for nothing really makes me a little bummed. I don't want to toss him to the side (if the aforementioned is what they're planning on doing) because of one mistake.