Dan,
I think you bring up an important question, albeit a challenging one. Psychologically, it is tough to think about leaving an EMR, just at the time you are becoming enthusiastic about it. (Pre-nups are pretty rare, though they may seem prudent to some

). It is especially difficult because you have no idea which EMR you transitioning to, and what it will be able to import. A generic .csv may be the best we can hope for as a bridge between the two.
AC gives you the option to create a .csv of all encounters, demographics, your contacts, and templates. You can also create a continuity of care record for all patients in CCD or CCR formats, which at least may be easy to get into a new EMR. While I have never done this, I don't understand what portion of that would require help from AC, as Wendell reports.
Your imported items essentially exist as pdf's now, and can be copied and accessed independently, if you choose.