There are very few businesses which can add 1+ Trillion to a companies market cap. To grow at pace with the S&P, Apple needs to find a new 1 Trillion dollar business every 2-3 years.

Cars were a good candidate, but it sounds like AAPL now thinks that GenAI is a better bet. ChatGPT is such a basic product, that it sounds reasonable that there will be bigger and better products in the future.