I really don't know. But speculating for a moment about 35 787-9s replacing eight 330s and twelve 747s leaves a net 15 more airframes. With 100 retirements over the next three years that soaks up the surplus. That then becomes the general target for fleet planning this decade. Anything less than 35 new planes means more VR and an aging pilot group.
An aging pilot group has its own attendant issues. American hired in late 2013 for the first time since 9/11. Their median age in 2013 was in the mid-50s. That is an unhealthy demographic for obvious reasons. Anything over ~43 is an indicator of both past and future hard times. Every time there is a discontinuity in the hiring wave there follows a schism between the past and the future: all institutional memory gets truncated to the immediate past only, and sometimes values get...modernised.