Winning cures everything. The Mariners won 91 games with ARod, let him go, then won 116 the next year. The A's won 102 games with Giambi, 103 the next year without him. I grew up an Orioles fan. They had a winning season every year from 1968-1984. While they were able to hold onto some players for entire careers, they also constantly shuffled players in and out, and retooled every few years. My point is, if you build a winning organization, then the fans won't leave when a favorite player leaves. If an organization is solid, stays competitive, they'll build the fans' trust.