Well if wolfs mark are so easy, just make them achievements. X amounts of wins should at least be not that easy to get (I mean the PVP mounts are still part of the rarest mounts in the game) and it will keep PVP alive longer than one season. I still believe that they choose to suddenly include limited mounts and minions (they only changed the last thanks to the complains) because they want more people to take part of the seasons or even PVP itself. I just feel that this wont help PVP in the long run.
Just a example:
I mean if someone starts PVP for the mount, because he wants it, he for example does 100 matches, maybe half of them are wins. He notices that he doesnt stand a chance against the top players (which makes sense since he is new) which means that he loses the will to go on, maybe he is even so frustrated that he wont ever join a season again. (I mean 100 matches is no small amount of time including the time to wait for it) At the same time instead of limiting the mount to this they could make it a achievement for 400 wins in the feast (if you take a 50% ratio this would make 800 matches) or make it that you have to play 500 matches in a season. Now he knows that he can work for it in his own pace. Maybe one week he will feel more like it and he joins a lot of runs. Others he does not want to because he has other things planned or maybe just no interest in it. Maybe one season he has no time but he knows that its okay, he can just try next season for the completion of the achievement.
There always will be people who lose interest on the way to the achievement, but at least for me, making it a nice achievement will keep the feast alive longer, while it will still keep the mount rare and something you need to work for.
A story from my experience:
I have someone that started PVP for the mount because he is a collector and he takes things really serious..after countless matches he gave up. He was way to frustrated with all the hate in the matches, with bad team members that blamed others, seeing his ratings fall back and so on. He said that the feast itself felt nice but that he was way to annoyed by everything around it, so he did not feel like playing anymore. Before he started he looked up any guide he could find, searched for the best way to equip himself..he was truly trying to get the mount. But the players in the feast really destroyed it for him..I never saw him giving up on something ingame before..he might start again for the minion in the achievement but he was not even able to be happy about that change..so frustrated was he..This might just be one case, but I am just trying to show that maybe this might not be good for getting new people to enjoy PVP in the long run.
And about rewards:
I agree that the top 100/10 should get something special, but I dont feel like it should be a mount or a minion. I mean if this game from the very beginning had exclusive ingame mounts (I dont talk about merchandise mounts and other outside ones) than maybe this would feel less strange but in every other content you always have the chance to get them later. PVP already has a lot of unique mounts, way more than the savage raids for example, I just find it sad that now another mount will be there and its also so limited..
Have a nice title as a reward, or an ingame board to show off. Maybe a nice icon for your name that you can wear (like the mentor crown thing) for a certain amount of time. Like if you win the season, you will be able to show the icon for the whole next season but at the end of the next season you will have to be top100 to keep it, or maybe you can keep it and can get another one.
So yes I am not really against PVP seasons having unique rewards, even though its one of the only content that has such a reward structure. I mean the world first savage groups get nothing special for it, there is nothing limited there, only the online pat on the back for their win and a nod from the devs. Its even worse since anything they can get in there, will be achievable by others later. You already get way more than them, so for me it feels a little unfair for the other groups in this content, that now its even a mount. Especially since the hellhound was on the wish list on PVE community.