"I think sometimes you hear people say if you had active protection, it would change the relationship between weight and protection on vehicles," he said. "I think that's largely a fallacy. Active protection is effective against certain threat sets with certain characteristics. In order for us to be able to take weight out, you have to be taking other armor off that currently protects us against certain threats. That threat is diverse enough that APS isn't going to catch everything. You need a mix of capabilities.Read it here.
The article is loosely written so I'm not sure if that quote is attributable to GCS PEO Brig. Gen. David Bassett or Col. James Schirmer, PM, armored fighting vehicles.
Either way its apparent that fielding an active protection system for US armor isn't a high priority.