The best replacement for z-wave is zigbee.

The best alternatives to z-wave are rated as following:
★★★★★  zigbee
★★★★★  insteon
★★★★  x10
★  upb
★  radiora 2
  enocean
  lightwaverf
  lutron
  c-bus
  wi-fi
  x-10

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Google Trends

Scale is based on the average worldwide traffic of z-wave in all years. Click on graph for more.
z-wave
zigbee
insteon