The best replacement for digital optical is hdmi.

The best alternatives to digital optical are rated as following:
★★★★★  hdmi
★★★★  coaxial
★★★  digital coaxial
★★  digital coax
★★  coax
★  hdmi sound
★  digital coaxial cable
★  hdmi audio
★  spdif
★  toslink
★  rca cable
  hdmi better

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Google Trends

Scale is based on the average worldwide traffic of digital optical in all years. Click on graph for more.
digital optical
hdmi
coaxial