Has ICANN 'reserved' some suffixes for internal use which it guarantees
will never be TLDs, to allow smart network admins to avoid this problem?
As far as I know, no.
The only reserved TLDs, to my knowledge, are "example", "invalid",
"localhost", and "test".
There are various application-specific TLDs in use, however. See
http://en.wikipedia.org/wiki/Pseudo-top-level_domain and the "Although
they have no official status, they are generally regarded as having been
unofficially grandfathered, and are unlikely ever to be allocated as
top-level domains." comment. Of course trying to use one of those will
fail if the relevant application is running on your network, so they
don't really work for future-proofing either.
-Boris
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