This is a discussion page so please add your comments below.
Perl4Caml and PyCaml are promising starts to the problem of integrating with existing Perl and Python code. Both Perl and Python look like they're going to be generating Parrotcode soon. There's even a project to port Perl5 to Parrot (http://www.poniecode.org/) which is actually being run by some friends of mine, and supported financially by a company in London.
So OCaml bytecode to Parrotcode might be important in the future.