2 formats will not work, the community is not large enough to support them.
Secondly, new players often feel the need to buy up all the old cards in the card pool. But they're not competitive due to lack of cards, its due to a lack of experience in the game.
If FFG really wanted to help new players they would update the Core Set, and the House Expansions to include some of the more universally useful cards in the older chapter packs.