The best replacement for binoculars is spotting scope.

The best alternatives to binoculars are rated as following:
★★★★★  spotting scope
★★★★  telescope
★★★  monoculars
★★★  scope
★★  monocular
★  rangefinder
★  coated optics wot
★  telescope difference
★  field glasses
★  coated optics
★  nikon binoculars
★  binocular
★  telescopes
  camera lens
  scopes
  swarovski
  opera glasses
  leica
  goggles
  leica trinovid 10x25mm bca black binoculars
  8x20
  nikon monarch binoculars
  zeiss
  rei binoculars
  camera zoom
  binoviewer
  leica binoculars
  8x42
  spotting scopes
  42

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

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

Scale is based on the average worldwide traffic of binoculars in all years. Click on graph for more.
binoculars
spotting scope
telescope