I don't think they plan on giving up the capability of amphibious operations, just integrate it into the Army. Remember the Army worked hand in hand with the Marines during WWII in the Pacific and participated in seaborne invasions (Army handled one themselves 69 years ago today pretty well). Add an amphibious warfare school to their list of responsibilities, like Air Assault and Airborne schools, and have divisions dedicated to that. Would cut down on a lot of duplication of procurement and supply issues. They have talked about this for years to try and make tax dollars go farther.