In this context, the following MS Word support utility, which I brought up before in a private support request, would help a lot already:
A simple option to format/export the google docs text with citations in the unformated Endnote style (curly braces with the reference ID in Endnote style). This way MS Word/Endnote users (vast majority of authors in academia) can continue to work with GDocs/Paperpile documents using MS Word/Endnote without re-associating every citation manually with their reference manager. Perhaps this could be handled simply by introducing a special citation style that mimics the unformatted Endnote style? - I have found myself in many collaborative writing situations where this would have been extremely useful. Expecting and/or teaching every colleague to switch to GDocs works only in some collaborations. When it comes to finalizing papers and grant applications every team of authors will switch to the writing tool the weakest link in the team is able to handle rather than the one they should be using as there is never an excuse for missing a deadline.