Older cards? When new scene appear you can always try to interest new people with "Classic". All i know i'm going to have fun with cgg as there will be people to play with. And i'm pretty sure i'll find someone to play during big lcg meetings. So, sort your cards, build some decks and be ready for 2017!
Could always just make several fun decks for everyone to have fun and experience L5R. I break out the Scorpion Coup deck every now and again for multiplayer despite the fact that it would lose to most. I've even been going back to make decks that were featured in the old Clan books.
It was the same thing for the WoW ccg and all those raid decks.