The best replacement for producers is consumers.

The best alternatives to producers are rated as following:
★★★★★  consumers
★★★  autotrophs
★★  directors
★★  decomposers
★  producers
★  consumers science
★  parasites
★  consumers biology
★  non producers
★  primary consumers
  consumers economics
  takers
  looters
  consumers worksheet
  bottlers

Your alternative for producers is not listed? Suggest!
Speaking about producers, one probably shouldn't forget about consumers.

Other search terms related to producers and their ratings are:
★★★★★ consumers
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Google Trends

Scale is based on the average worldwide traffic of producers in all years. Click on graph for more.
producers
consumers
autotrophs