Sweeter Grapes (revisited)

So what if after all that hard work, the fox discovers the grapes really are sour after all?

Should the fox just suck it up and appreciate the bitter taste or sit around thirstily, waiting for the grapes to ripen?

Oh! How about if the fox just ran off about its business and checked back often? But what if by then those precious grapes have fallen, or gotten eaten, trampled? What if they end up staying on the vine past their prime and simply turn to rot?

Maybe the first fox was right to just go bitterly on its way, forever haunted by the waste...