Unlikely, because of their PR-machine.
As a simple statement of fact the U.S. doesn't need the marine corps in order to be a military power. The marine corps' two main claims-to-fame are (1) they are America's "expeditionary force-in-readiness" and (2) they are trained, equipped and configured to perform forced-entry amphibious assault.
The U.S. Army has conducted both missions numerous times in it's 234 year history. It has functioned as an expeditionary force in the war with Mexico, the Spanish American War, the Philippine Insurrection, the Boxer Rebellion, the Korean War and arguably, WWI and the first & second Gulf Wars.
The U.S. Army has conducted amphibious assaults during the war with Mexico, the Civil War and WWII, among others. In fact, the army has conducted more (and larger) amphibious assaults than the marines have. (The marines take pains to *not* advertise that fact).
There were more soldiers in the Pacific, during WWII, then there were Marines in the world! Until 2006, there was NO Marine SOCOM unit and currently NO Marine unit in JSOC. Majority of amphibious missions after 9/11 have been performed by the Army and Joint Special Operations Command. (e.i. Rangers) and as stated before, Army has performed MORE and LARGE amphibious assaults then the Marines ever have or ever will.
Infantry training is practically the same for both Army and Marines. An extra 2 weeks of "Basic Combat Training" (to mostly teens) does not qualify or quantify the assessment that Marines are better prepared. Most of the Advanced Combat Military Schools are operated by the Army. ex. Air Assault, Air Borne, Sniper, OED, etc. They also have more "advanced" combat units: Green Berets, Deltas, Rangers, 160th Aviation, Airborne Units, etc.
In this era of dwindling resources something has to give. The army needs two more divisions. The corps should be reduced proportionately in order to make that happen.