The best replacement for homeplug is repeater.

The best alternatives to homeplug are rated as following:
★★★★★  repeater
★★★★★  wireless n
★★★★★  moca
★★★★  wireless extender
★★★  powerline
★★★  wireless bridge
★★  g.hn
★★  wifi extender
★★  range extender
★  ds2
  hpna

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Speaking about homeplug, one probably shouldn't forget about homeplug.

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

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homeplug
repeater
wireless n