I more ment getting ALL your Pikmin to higher places, but if some sort of falling damage mechanic was put in they could become a sort of safety net or an alternative for crossing water as they can act as lillipads or something
Wouldn't it be cool to have a brown Pikmin. They could be immune to Toxic waste. They could have gills but not swim in water. They could go into pools of toxic waste and stuff. Pikmin 3 could bring back the Smoky Progg and have a Pikmin immune to it's power.
Son, I brought you into this world, and I can take you out just as easily, now clean up your room.