While people are thinking of what they can do to support the game in a year which should bring new interest to 5th edition, some obvious things are:
Do an actual play stream or podcast - apparently these are very popular for attracting people to try different games, and showing how the rules work.
Launch a new play-by-post game - we have a forum here, and I've seen others run games on rpol.net - I haven't seen any new Ars games launched lately, but ones suitable for new players should get tons of interest.
Write up your scenarios - the more scenarios available for people to look at, the easier we make it for new storyguides (and also provide inspiration for SGs whose sagas need something to run this week, or for other people to try their hand at being a beta-storyguide)