If this becomes a thing the scroll should be more expensive since it's breaking the original xmog rules and has a privilige.
No downsides? True. This *could* actually have many downsides if we discussed this as oldschool core players who like to keep things as they were originally planned, and keep the realms more and more Blizzlike. BUT there is one extremely important thing to keep in mind. You can turn the xmog feature off. This says it all and solves many many problems. It's not mandatory to look at weird xmogged DKs or anything like that. The only problem is that let's say I like my own traditional rule-obeying oldschool paladin xmog and I want to see it so I won't disable xmog of course, which means I'll also have to look at other player's rule-breaking xmogs. This was just an example.
Some dude asked if we could have a pet xmog some days ago, that was a bit extreme but this one can be alright if there are enough ( many many ) players asking for it.
http://www.wowtransmog.com/official-...fication-rules