Most "3DS AAA games" or "DS AAA games" were AA games (or good indie games) anyways.
A more powerful system is no problem. Not every game has to use all the resources of the system to be considered "good" or "great".
Of course, which is my point. Games that were considered AAA on past Nintendo handhelds are now held to a higher standard on the Switch, which means more development time and resources are needed. Even Big 3DS games required larger budgets and more staff than their DS counterparts. AA and low-budget games are far from dead, but it is true that moving to the Switch will demand a lot from the AAA handheld developers.