I can't imagine granting diamond reserves the full breakfast at US hotels.
That would be logistic nightmare.
"no you are a diamond, she/he is a diamond reserve so gets more".
Plus the owners would cause a riot.
The US f&b credit is to stay.

So place your bets ..... my lucky chip on 7777 royal flush poker:

My guess that Diamond reserve will move some benefits from subject to availability to guaranteed:
- late checkout guaranteed (owners can be swayed & consoled; exception clause for resort & casino & holidays)
- guaranteed upgrade cat+1 (owners can be swayed & consoled: just create more room categories)
* above copied from Marriott & Hyatt & IHG

Plus for diamond reserve some extra thrown in that flatters the ego:
- 24 hour room guarantee
- special hotline / email service
* above copied from Hyatt & Marriott

So what would Hilton need to offer to Honors Society status (per invitation only)
as to make it even more special than diamond reserve?
- lounge access without exclusions
https://www.hilton.com/en/hilton-hon...estone-bonuses
Thus including finally Waldorf Astoria Rome's Imperial Lounge, the Sakura Club at Conrad Washington, D.C, Citrus Club at Arizona Biltmore and Club Signia at Signia by Hilton hotels.
- Guest of Honor benefits for occupants of the extra booked rooms during your own stay
- exhaltation of highest service at hotel (GM + senior management)
- early check in guaranteed at 10.00 H morning
- guaranteed hospitality room to tide you over / refresh in case your booked room / upgrade is not ready yet

* as invitation only status, HH can control the influx into the ecosystem and strain and drain on hotels providing Honors Society benefits which might turn into costcenters and thus can easily adjust every year by culling amount of invitées due to undisclosed invitation only criteria
* copied from Hyatt Courtesy card, Marriott Cobalt, IHG, Royal Ambassador + Inner Circle status: these are all the per invitation only statuses at the competitors

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So after next weekend when all bloggers and thoughtleaders have met with Hilton HQ to be briefed about the HH changes, we can expect an echochamber on all media channels:
- Hilton Honnors: "we teased and leaked infirnation to get judged by our customers and thus we listenend and adapted!"
- Bloggers : " Aspire creditcards and the HH changes how does it affect you, we can pump out content ?
- Hilton HQ "we blatant copied the best of Hyatt and Marriott and IHG to lure you to irrational spend incentives to increase profits while not upsetting our hotel owners in providing to much benefits that become costcenters"
- Hobbyists and those in the hobby: "good topic to liven up a Christmas party but be like OMG -hello guys- put it on TIKTOK!"
- Flyertalkers : "Not counting the 12 days before Christmas but the tantalization of Hilton Honnors.....what's this nonsense?!"