Third: we're finally going to delete the old Ada compilers: gcc3-ada and gcc34-ada. This has been discussed on and off for months and it's time we finally did it. This means there will be no Ada compiler for netbsd-4; however, if netbsd-6 isn't unduly delayed netbsd-4 will be EOL by the time 2012Q4 appears... and even if not, I rather doubt anyone's using Ada on netbsd-4 anyway.
I believe netbsd-4 would still have an Ada option any. lang/gcc34 option.mk indicates Ada could be specified as an option given a bootstrap compiler. This is the same requirement as gcc34-ada.
I don't see any reason to oppose these two package deletions. John