The best replacement for dng is raw.

The best alternatives to dng are rated as following:
★★★★★  raw
★★★★  nef
★★★  cr2
★★★  tiff
★★  pef
★  jpeg
★  psd
★  dng
★  png
★  arw
  rw2
  raf
  raw files
  raw lightroom
  jpg
  nef lightroom
  xmp
  orf
  nikon nef
  native raw

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

Other search terms related to dng and their ratings are:
★★★★★ dxo
You have in mind a companion for dng and it is not yet here? Propose!



Google Trends

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dng
raw
nef