I think Nintendo is actually foreseeing not many players utilizing online capabilities of Omega Ruby and Alpha Sapphire for the first ~week or so, given that everyone would be starting on equal footing as far as catching, training, and breeding Pokemon goes. Players just starting out won't be doing much trading or online battling without time to actually make it so these things are viable to do. That said, players of Sm4sh on the Wii U will be gearing up almost immediately to play online, so there will be time for Sm4sh to settle when ORAS players are getting off the ground online.