I think about spaced repetition forgetting curves for marketing/branding absolutely all of the time. 

Did you just launch? You need to get in front of people again at 2, 7, 30 and 60 days later if you don't want to be forgotten. 

This is the stuff brands are built on.

A good and interesting idea is one that sparks creativity and innovation, often by identifying unmet needs or untapped opportunities, and is supported by a clear understanding of the problem it aims to solve and the target audience it serves.

In the context of marketing and branding, a good and interesting idea could be the concept of spaced repetition forgetting curves, which highlights the importance of consistent and targeted re-engagement with customers at specific intervals to maintain brand awareness and prevent forgetting, as you've aptly described in your example