You still be able to use flash 11.2 and receive security updates for another 5 years. Unless there is going to be massive progress for flash (which we already know there isn't) this isn't really news. They are basically saying if there ever is a flash 12 it will not be supported on linux.
That hasn't been true for a very long time. Just using the linux flash plugin with nspluginwrapper on a native firefox has been the preferred method for flash on FreeBSD for several years now. I have not yet tried to use the linux chrome plugin with a native chromium, but that may also be a possibility now or sometime in the future.