This is the phrase I needed to hear: " You cannot simply say
  that spacetime is the string or the "sheet" traced by the string
  as it moves, because it has not enough algebra to describe what
  can be described in standard general relativity. That's a
  problem which has been "pushed away" by means of the holographic
  principle which states that gravity will be forced to obey
  string theory."* Andrei Tudor Patrascu, theoretical physicist
  [and a good friend of mine] Indeed. So often the task of
  bringing two less-than-compatible things together (it's not just
  in physics) brings many answers to the table that require one
  side or the other to COMPLETELY abandon something critical and
  submit to the will of the other side. Of course that's not
  acceptable so negotiations continue.