The current maintainer, or well, past maintainer.. Deanna Phillips, has pretty much given up on work involved maintaining gnash (..it is rather large, lots of dependencies).
Waiting for someone else to do it isn't really the right mentality, try doing the work to and send it to the ports mailing list and ask Deanna to takeover maintainership.
Or you can just wait until Flash is rendered useless by wishful thinking, that's what I do, the sooner the better.