If you are going to remove War's retreat the benefits basically HAVE to be moved to POH.

I can see no other way such immensely useful QOL can be kept. Scrapping war's retreat and just removing boss portals entirely would just be horrific game design. It seems very likely that War's Retreat WILL be removed. I've heard a lot of rumors about it. And if we know anything about RS3 rumors there's always some truth to them.