Does Remington still have the R 15 and R 25 line? If so maybe they are going to push the R line over the DPMS and Bushmaster lines.
Iknow in 2015 when I was at the factory they were just finishing up an order for the Phillipine military. We were told it was the first time the PI had gotten weapons that were new and not surplus. ( I can believe that after being sttioned there for 3 years and seeing what they had then).
You may be on to something. While all the discontinued lines were first "announced" by removing their websites, and largely blanking their product line from the Rem corporate site:
The he R15 is still there. And there's a whole, VERY hunting oriented, MSR page with several models: