After I posted the info just above, I went to the Marriott Vacations Worldwide investors web page and found a presentation the CFO, John Geller, did at a Barclays Bank conference a couple of weeks ago. In that presentation, he specifically references a common points product that they plan to be selling at all Marriott/Westin/Sheraton sales centers in 2022. He said they were working on the technology now.
I've posted the details in a new thread, since this is significant new information that has not before been posted here to my knowledge. Below is a link to that new thread:
https://tugbbs.com/forums/threads/new-info-on-marriott-westin-sheraton-consolidate-product.312412/
I'll leave it up to the moderators whether they want to recombine that new info back into this thread, but I felt it was a significant enough bit of new intel that it was worthy of its own thread.