I have some real concerns about the future of competitive LCG's: the buy-in gets insane. Initially, it's not bad, you buy a core set, maybe 2. The additions are a set of $10-$15 decisions. After a couple rounds of expansions, getting new people into the game becomes a huge challenge. Too many cards to get your head around, and the up-front cost is very high. The co-op games seem to work a lot better. Adding a new player into LotR - swap over to easy mode. Playing with a 7 y.o? sorted. Getting a new friend interested? sorted. Working with a theme deck ? sorted. Arkham LCG is even better - use the easy bag. Someone with a single core wants to join the campaign: sorted. I love how you can easily play with people who go all-in and people just testing thing out. I enjoy the both styles of games - but the co-op just feel like they work out better.
Anyway, I'd love to see a "Battle-tech" co-op game (with an optional head-to-head mode). You pick a 'lance' of 4 mechs. Run them through a campaign, a set of linked scenarios that carry over. (I have some battletech-nostalgia, but really... the theme could be warhammer 40k, starship troopers, aliens vs space marines, robotecth, or just about anything.) You a are a mercenary company, hired into a campaign. You have some core units you enhance with extra armor/weapons, you recruit allies, you have special tactics. As you progress through the campaign, you get more experienced (like Arkham), but also build up damage.
Please, please take my money.