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In addition to hoffmanm's question about the renaming of
FileInput, two issues:
- An additional module, especially with only a few lines in
it, is not going to be accepted into the stdlib. This is
better done in your own code, where you know what types of
files you will encounter.
See patch #1215184, which implements a similar openhook for
fileinput.
- Only bz2 is too selective. You would have to have modules
"gzfileinput", "urlfileinput", etc. Too much name crowding.

For these reasons, rejecting this patch.