Even tho I disagree with the decision to close down the Arena, I do fully understand and support it. The only thing that bugs me is the Good Boy Set. I believe that, being 49 almost 50 at the time of the cutoff, I earned the rewards, I feel like no matter how much you've played, if you're not rank 50, you're as good as a rank 5 and it kind of ticks me a little bit, especially since I was planing on playing in Arena with friends this afternoon to get my rank 50 (I'm in NA-Est Timezone). To that I could think of 2 quick solutions:
1st - Give players until the 1st of February before cutting off, it would let players who want to get that set the bonus exp of the Community Day, if they swish to spend a part of it in the arena and not in the Adventure mode
2nd - Lowering it to level 40 or 45. Could be lower, to your own discretion, but anyone who has about those ranks played enough to be worthy of the set in my opinion
So yeah, these are my 2 suggestions! :D