It looks like Marriott's affiliated all-inclusive resorts won't be exclusively branded Autograph Collection:
https://all-inclusive.marriott.com/our-resorts
I wonder if non-resorts could become all-inclusive. If I was the Sheraton at an airport somewhere competing against 12 or 15 other mediocre airport hotels why not offer a full-board rate? After all, many properties across all brands already offer packages that include breakfast and a dinner credit.