Given their market size in a division with three small markets, I think it is reasonable to expect the Sox should win the division, on average, once every three years or so, or three times in a given 10-year span. Given that, they should advance to the ALCS on average once every six years, and to the World Series once every 12 years. That extrapolates to one World Series championship every 25 years, and so I just don't think that is too unreasonable to expect as a fan.
The universe is the practical joke of the General at the expense of the Particular, quoth Frater Perdurabo, and laughed. The disciples nearest him wept, seeing the Universal Sorrow. Others laughed, seeing the Universal Joke. Others wept. Others laughed. Others wept because they couldn't see the Joke, and others laughed lest they should be thought not to see the Joke. But though FRATER laughed openly, he wept secretly; and really he neither laughed nor wept. Nor did he mean what he said.