The best replacement for facilitated diffusion is simple diffusion.

The best alternatives to facilitated diffusion are rated as following:
★★★★★  simple diffusion
★★★★  active transport
★★★  osmosis
★★★  passive diffusion
★★  facilitated transport
★  diffusion
★  carrier mediated transport
★  ion channels
★  ordinary diffusion
  normal diffusion
  secondary active transport
  regular diffusion

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Speaking about facilitated diffusion, one probably shouldn't forget about active transport.

Other search terms related to facilitated diffusion and their ratings are:
★★★★★ active transport
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facilitated diffusion
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