Why did the Berlin Defense of the Ruy Lopez disappear from the play of World Champions before Kramnik revived it? The Berlin defense of the Ruy Lopez was played by the likes of Steinitz and Lasker. 

[FEN ""]

1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6


However, it soon disappeared out of the play of World Champions and they rarely played it, before Kramnik revived it. What were the reasons for this? Was it merely a matter of the taste of the positions resulting from the Berlin or was the Berlin considered to be bad for Black after the period of Lasker?
The reason, as far as I know, it is because it is drawish. GMs look for opens that are either heavily imbalanced or uncertain, like the sicilian or the scotch, or quiet oppenings that allow positional manuevering, like the Caro-Kann. Drawish lines are used by GMs solely when they are required.
Another reason is that the Berlin wasn't almost played at all in GM level. Kasparov didn't have such a deep knowlege of the opening, unlike Kramnik. Openings decide games in World Championships.