Berkshire Hathawayshareholders mourning the departure of legendary investorWarrenBuffettanticipate the conglomerate he built over 60 years will retain its long-term focus and culture but worry about the loss ofBuffett’s vision and star power. FollowingBuffett’ssurprise announcement on Saturdaythat he would step down as chief executive by the end of the year, Berkshire shareholders and fans said the...