Anthropology may be reducible to sociology, as sociology
  involves systemic stereotyping (anthropology generates useful
  stereotypes of subcultures) via statistical analysis typically
  combined with the storytelling which is also similar to
  anthropology. There *is* a blurry line between sociology and
  psychology when considering small groups in sociology and the
  psychology of groups. It's likely possible, although it's like
  the difference between one or two bodied systems in quantum
  mechanics and chemistry: quantum mechanics *can't* handle more
  than one or two atoms as once. chemistry can. They need to
  remain separate, likely for a long time to come. Even quantum
  computers with their theoretical ability to crunch larger
  amounts of data more efficiently might not be quite enough to
  handle chemistry via standard model up to chemistry. So it's
  best they stay separate. There's some missing "connecting
  pieces" between the major scientific disciplines (not so much
  the minor ones) that need resolution and they're usually pretty
  big reasons. But I think we can PROBABLY reduce the hundreds of
  disciplines back down to the 5-10 we had 120 years ago.