Right, it should certainly not be included in its current state in next
release.
But there is more into it. If you for instance try to install Opera from
stable (or oldstable or testing or unstable...) the .deb recommends
pepperflashplugin-nonfree, and you may end up to a situation like this:
https://askubuntu.com/q/1305914
So instead of dropping the package, I think the best thing to do is to
convert it to a dummy transitional package in all supported releases as
well as testing and unstable.
flashplugin-nonfree was handled by just dropping it:
https://bugs.debian.org/969112
But that has already happened, and so be it.
More talk about this topic at <https://launchpad.net/bugs/1871471>.
--
Cheers,
Gunnar Hjalmarsson
https://launchpad.net/~gunnarhj
