I flew to Berkshire Hathaway's first big bash without Warren Buffett as host. I found an event with an uncertain future. I snapped a picture in front of the welcome sign at Berkshire's meeting this year. Theron Mohamed/Business Insider I flew to Omaha for Berkshire Hathaway's first shareholder meeting with Greg Abel as CEO. Several attendees cast doubt on the annual gathering's future without Warren Buffett hosting it. Many said the meeting has lost some appeal now that Buffett and Charlie Munger are no longer onstage. I flew to Omaha this week to attend the first Berkshire Hathaway shareholder meeting in six decades not led by Warren Buffett as CEO. My conversations with more than 20 shareholders, analysts, and executives pointed to an uncertain future for the iconic gathering now that Buffett has stepped out of the spotlight.…