Luckily it looks like A:NR is at least an order of magnitude more popular than previous LCGs so the cards should stay in print for a while - a bigger issue is that at a certain point, the need to have a 'complete' set is going to be a very expensive proposition. But I agree, the downside of not having a built-in obsolescence/reissue function is that old cards might go out of print.
On the other hand, it's just so much better to play. It actually feels like they made a big list of everything that is wrong about MTG and fixed it.
They also had the chance to undo mistakes and rebalance things from the original Netrunner.
The constant release of new data packs is eventually going to become really tough for new players. I hope they run some kind of restricted tournament format (e.g., only the core + most recent data pack cycle + most recent big box expansion) so that the keen newbie doesn't have so much of a buy-in, but they can grow into the open constructed format later.
On the other hand, it's just so much better to play. It actually feels like they made a big list of everything that is wrong about MTG and fixed it.