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Marchhare
Unfortunately this would most likely do the exact opposite and increase the dragon surplus because dragons that are not eligible to breed now would be with a sex change.
It would mean that people who are waiting for their perfect dragons would simply change the sex of one and start breeding instead of waiting until they can find it. I have heard that a lot of people who breed for the mates to their dragons tend to exalt the ones that don't fit.
I agree with the rest of the post.
Plus, there is really no need for this. One of my dream dragons is a Violet/Blue/Royal Coatl Permababy with Iri/Shim/Glim. The sex doesn't matter because it is a perma baby. I looked about a month ago and didn't find any dragons close to my requirements, there were like a handful of violet/blue/royal dragons, no coatls and none with the genes.
The other day I mentioned this combo again and someone offered to help me breed the combination. They told me to find dragons on the AH that would potentially breed the correct colors with their coatls, so I went looking.
I found this girl:
She had Gembond when I found her, and a blue tert, but the other two colors and genes were perfect. On a whim, I went looking for a mate for her, because after all, I had two of the colors down, and I found this guy:
The EXACT colors I wanted, and two of the 3 genes I wanted.
I bought both of them for 28,000 treasure. Glimmer for the girl: 1200 Gems. (*sigh* still need glim for the male).
If you have a dragon, unless it is a gen 1 as sopheroo says, chances are, you WILL find the exact color combos you are looking for. Maybe not that day, maybe not in a week, but it won't be long.
So, no support. there is no need for one, and yes, I don't have to use a scroll if I don't want to, but opening up breeding possibilities affect everyone playing the game, not just the person using the scroll. The pose change scroll mentioned would literally only impact the person who uses it. There would be no breeding partners opened up.