Funnily enough, I found interest in Chicken Smoothie when I was 10. The UI and the forums were overwhelming at first because, well... I always thought forums were terrible due to their early-internet nature. However, the art and trading was very appealing to me. I wholeheartedly enjoyed the feeling of happiness every time I got something that was considered rare in any game.
I don't think they should sell the game YET, but the stagnant gameplay has started to become obvious despite me returning to the game for an entire month. I can already see the only thing keeping most members going is trading. There is no more vigor or innovation.
I've seen very little numbers of new players coming while old members are quitting every week. I know for a fact if they don't take a gamble and update the entire site they won't be able to get the attention of future new players.