Don't count on it.
There are billions tied up in current rifles & carbines (and all the ammo). It would take a truly amazing amount of significant difference for riles and carbines to be ditched.
Now, changing to a lighter-weight ammo for helo and aircraft use would be significant. And is exactly the sort of thing that could be adopted quickly. Grunts will still soldier on with what we have.
DoD has a long history of ginning up these demonstrations once every decade or so, tossing a few millions at each of them, and they just walking away.