Disney's ( DIS) board has said that management is on the right track.But, as one may be reminded by Disney's recent setbacks, the company's directors have scrupulously avoided saying when they expect Disney's metaphorical train to reach its destination. That leaves investors wondering how bad present and future disappointments will have to get at Disney before Michael Eisner, who last month exited his post as Disney's board chairman, loses his remaining responsibilities as CEO. And certainly, Wall Street has high-profile disappointments to consider, including two weak movie releases in two weeks and continuing uncertainty at the company's ABC television network as the upfront ad-selling season approaches. Now the question is how soon the negatives will be offset by tangible pluses, and when critics of the company will stop piling on. On Monday, Disney's shares fell 55 cents, to $25.70, down nearly 10% from the 52-week high the stock hit in February after disclosure of Comcast's ( CMCSA) unsolicited bid for the media and entertainment conglomerate.