I don't see America getting rid of the M16 platform for a very long time. The newer weapons like the ACR/SCAR may see use in special forces units such as the Rangers, but I can't see America changing it's regular weapon unless technology changes (such as caseless ammo becoming reliable and economical).
To change over production for an army the size and scale of the US military is just too expensive. When you consider the almost modular nature of the M16 platform it seems more feasible that they would just upgrade what they have. A good example is the HK416, a modern, more reliable weapon. M4's can be converted to the HK416 by replacing the upper reciever.
I can see the US military using M16/M4 platforms for maybe another 30 or even 40 years.
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