Alitalia can always introduce brand new cabin structures when it's profitable, but it's the customer experience improvements which should make the real difference here.
Delta, American, United and Southwest are enjoying their moment now, with industry consolidation stabilizing the market, so they aren't likely to risk the disruption that Lufthansa's actions are likely to trigger.
The program is advantageous to travelers and to national security, but this “blue seal” CBP approval could make certain routes and hubs more popular than others. No doubt, both airlines and airports take note of this.