When the end-of-life is reached for a version, send one more update, consisting solely of a message that the end of life has been reached and whatever you'd like to say about getting a newer version. EOL status is easy to miss, since many of us Fedora users probably are not active in the Fedora community. I more or less missed it for F20 by about a month. If you have EOL stages, such as one date for general updates and a later date for security updates or any other pattern of staging, send a similar message after each stage. While my experience giving rise to this enhancement request is with Fedora 20, I, by definition, cannot test it in any later version and presume it should be considered for F21. My hardware is AMD. I do not know which Fedora component is relevant.
Since the request has nothing to do with fedora-review itself I am switching this to distribution component, though IMO this will require discussions on devel mailing list. I won't take that up on myself though, it seems more like a generic "Feature"[1] [1] http://fedoraproject.org/wiki/Features