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While I am by no means an expert, I would answer your question by saying that a bishop will get 2 more opportunities to take the pawn that got past the bishop's attack on the square the pawn skipped by moving 2. Bishops, or any of the pieces [as opposed to pawns] can change directions and move backwards. Pawns cannot do this; they have only 1 opportunity to capture a neighboring pawn, which occurs when and where the opposing pawn is 1 square diagonally forward of the capturing pawn. The 2-square pawn move without en passant would deprive a pawn of its only opportunity to capture the double-moving pawn. It does not deprive any piece of all opportunity to capture the double-moving pawn.