According to Fils-Aime:

Fils-Aime continued to share the strategies his company knows will work for the 3DS. Offering different colors and changes in screen sizes has continued to be a major factor of success for the 3DS as well as the 2DS. 

Not only were tech innovation and variation discussed, but the interview also addressed what makes owning any gaming device worth it – the games:

New content will continue to be released to the 3DS. Although the Switch has gained a tremendous amount of publicity and attention, Nintendo will stand by its previous handhelds as well.