I can understand your feelings that this skin was actually pretty rare and wasn't seen all too much, but for people like me, who haven't played this game for that long of a time, it's a nice gesture to be able to obtain him. But as far as I can tell, all Traditional Skins got set as Legacy status, meaning that there was a chance that they become available for purchase sometime.
Just think about how people would feel, if Riot would put up a much rarer, non-legacy skin, like PAX Twisted Fate in the store. Man, some people would go jump right out of the next best window.
I honestly never got any other friend to play LoL so I sadly miss out on Grey Warwick too, which has a very nice ingame model and he was my very first Champion in the game. Knowing that he's now officially on the rework list, I hope they figure a way out how people can get him then, in a way where RAF people wouldn't just be completey fcked over but honest people like who just don't create X fake accounts just to get that skin have a real chance to put it into my collection.