Links to back any of that up?
AMD themselves say that isn't the case on their own Faq, which i've posted above. Yes scaler makers are releasing scalers but not "by default", they are seperate products that require the panels to be specially qualified to work with adaptive sync, which all costs extra to implement, it simply isnt going to be included in every monitor and AMD themselves highlight this on their own website.
The only monitor that had been listed up as being backwards compatible was the iiyama 4k and that claim has now been rescinded, it might get reinstated, but again erring on the side of caution I would not automatically assume that.
You are working from a set of false assumptions.
Where is the announcement that intel are supporting adaptive sync?
AMDs future GPU's supporting it is irrelevant until and unless they outsell nvidia, which also doesnt seem likely based on past results.