Baseballs in the stands: End of the tradition?

In light of the controversy over Ryan Howard's home run ball, as well as past controversies over other record-setting and significant balls, I wonder if we are heading towards a change in how baseballs hit into the stands (at least fair balls) are treated.It seems to me that MLB and individual teams control this. Fans keeping baseballs is a matter of tradition and historical practice, practice that is not followed in most other sports--football, basketball, tennis. The question of how a ball should be treated under state property rules depends on the teams--the owners of the stadiums--not simply declaring that all balls remaining within the stadium (or remaining within the stadium and in fair territory) remain the property of MLB and must be returned.Such a move would not be popular, of course, as it flies in the face of the intrinsic joy of fans catching home run balls. But I wonder if teams might find it better than getting into disputes when players want important balls, not ...