Export to Commodore 64 Disk Image (.d64) et al
Based on its roots in the 8-bit world, Inform 7 should pay homage by exporting story files into those formats (i.e., a disk image playable in emulators).
Obviously certain restrictions would apply, so it would be up to the authors not to exceed those restrictions (or Inform could help).
FYI, the IF archive (ifarchive.org) does have some utilities that allow translating .z5 files to .d64 files, e.g. d64toinf which can be found under /infocom/tools. I got it working the other day using VirtualBox, FreeDOS, and VICE-c64 without too much trouble. (I think the trickiest part was putting the requisite files on a virtual CD or diskette that could be opened by the FreeDOS VM.)
Important to note: The I6 overhead associated with I7-compiled stories seems quite high for virtual c64s to handle. It works a lot better with native I6 code. Also, surprisingly few notable published games can fit in the maximum 2 disk sides allowed by the converter.
Did I say it was an advantage over what already exists?
"Inform 7 should pay homage by exporting story files into those formats (i.e., a disk image playable in emulators)."
You can't get much more of a homage than exporting into the exact format Infocom used! There are even modern C64 Z-Machine interpreters: http://www.intfiction.org/forum/viewtopic.php?f=38&t=8817
What concrete advantages would exporting to a C64 disk image have over Z-Machine/Glulx?