This is more a matter of over-specific writing styles than too many options.
If a product has mechanics that don't balance properly with default D&D, then you can't mix and match them without effort (say, oh, Dark Sun characters). If the mechanics are tied too closely to the setting (ley lines or something), then you have a similar problem.
Really, with the new categorization of monsters, you could easily have adventures designed with thematic "skins." Have your basic adventure outline with generic plot elements, hooks, and so forth, but without references to specific monsters, classes, and so on.
Say you want to design a generic "damsel in distress" adventure.
Adventure synopsis would be "high-ranking commoner-classed individual at lower range of young adult status is held by solo monster themed combative organization and held prisoner in dangerous maze-like with hazardous terrain features, inside a tall structure. Individual is ultimately guarded by solo monster of theme."
You could just as easily have:
"Tomboy samurai princess willing goes with noble ronin hobgoblins in stylized "dragon" armor seeking tax relief from tomboy's evil uncle, watched over by a silver dragon holed up in a mountain filled with natural hazards."
or
"Scottish Village Mayor's son who has dreams of being a great artist is kidnapped by a horde of lesser demons and taken into an abyss-warped tower that sits on top of a trap-filled maze, held by a terrible uberdemon who wants to use the boy's talents in a terrible ritual."