I get regurgitating the doctrinal brainwashing everyone gets in PME, but the truth is there is nothing agile "agile" in the USAF's ability to "outpace adversary action through movement and maneuver to achieve commander’s intent."
And the ACE concept is not as strategic as you think, its goals are fairly operational and in some cases even tactical in nature...
"When applied correctly, ACE complicates the enemy’s targeting process, creates political and operational dilemmas for the enemy, and creates flexibility for friendly forces. To effectively accomplish joint force commander objectives, ACE requires reexamining a wide variety of enabling systems, to include: command and control (C2), logistics under attack, counter-small unmanned aircraft systems, air and missile defense, and offensive and defensive space and cyber capabilities"
For the most part the Air Force has always been more reactive than proactive, and I don't expect that to change in the future no matter how many think tank reports it adopts. Creating buzzwords (e.g., MCA) and renaming units to "sound more expeditionary" is lipstick on a pig, until Big Blue truly works through the problem and invests in its ability to move quickly and effectively to counter a threat, the results will remain the same (i.e., predictive)...