Hi John,
But they did offer some tentative support for my second suggestion of changing the meaning of bare "netbsd" --- "netbsdaout" would still be available to unambiguously request a.out for anyone that wants it.
I think that this would be OK for the binutils, providing that when configuring for just "netbsd" there was a prominentant message in the config log saying something like: "netbsd format now treated as ELF based. Use netbsdaout if you want a.out format files". (Probably with slightly better wording than that). Cheers Nick