The Nintendo Online Service NEEDS the exclusive classic library. How else are they going to entince new people to buy their online service past the September launch and keep users renewing? Smash, Mario Kart, Mario Tennis, and Splatoon will have already launched. Pokemon, Mario Party, and Animal Crossing are the only current major franchises left in their pocket to get people excited about online features.
So in my mind "Virtual Console Banner" is just PR talk. Outside of some select exceptions (Mother 3 for example), there will not be individual classic releases on the Switch.