Question: As far as I know, a lot of cards (in TCG world) are stopped being produced (and available in stores) at some point. Is there a known life span for Android Netrunner expansions? For example is there a known life span such as 2 years at which the "Genesis" six-pack will no longer be produced and available in stores so if you don't get it until then you'll have to get it second-hand from somewhere?

Answer: 
All packs will just be produced for a couple of years. When the production is stopped, you can't play with the cards at tournaments any more.

When the production of the first pack in the eight cycle has started the production of the first two cycles will stop and the cards will be banned from tournaments. The same thing will happen when the production of the first pack in the tenth cycle has started but with the third and fourth cycle instead.

Here is a link to more information:
<https://www.fantasyflightgames.com/en/news/2014/11/5/a-new-stage-of-growth/>
FFG made some promise when they started their LCG (Living Card Game) model, and this promise includes the fact that there should never ever be a concept of rarity in their card game. All cards should be as easily accessible.

This also includes the fact that they will re-produce older packs if there is a demand.