I reckon there is a bit of fat in the 737 utilisation. Certainly the Jetconnect deal is about getting better utilisation as is the Network A320s. I suspect though the reason is more about utilising them transcontinental to release A330 capacity internationally than any IR ploy (as Isdon pointed out).
So maybe ‘inefficient’ isn’t quite the correct term and perhaps releasing increased efficiency would have been a better way to put it? Either way it appears an increase in utilisation of the fleet and that’s a good thing for mainline crew- and of course still keeping an eye on that damned horse!