I think the EA's sports games are the most important, if neccessary Nintendo should offer to pay for the development costs of those NS versions if EA is unwilling to.
Because a platform without FIFA/Madden NFL/NHL really loses its claim to be a "mainstream" platform. Even kids/casuals love sports games.
The big PS4/XB1 adventure/action big-scale games ... I hate to break this to you guys but those aren't going to happen a lot IMO. Those are games that tax a full blown XB1/PS4, they are going to be too much of a pain in the ass to port and the sales of those types of games aren't going to be worth the effort. If Wii U fans complained about COD: BLOPS2 and Assassin's Creed not being pixel perfect, they are going to be in for a rude awakening with Switch versions of games like that. There is going to be a large downgrade.