Hopefully there wont be a thread from expert PvPers at the end of the season that complain about loosing the mount because so many more Non-PvPers jointed the Que and made them lose matches. Because if you have something like that as a price and people that normally wont PVP will try it to get it..well you will have a higher chance of having people in your group that have no idea about PVP which will mean that you might lose because of them.

I still see it way better for the long run if you could win mounts and minions from achievements or with wolf marks instead of making them such a limited reward..people that joined this season for the first time will probably not stand a chance against seasoned players and this might annoy them that much that they wont come back to PVP again. But if they have a goal that they can achieve in their own time, they might just play PVP steadily.