1) Last time we visited (Mar-2015), nuggets were not an option, just drumsticks.
2) WDW is trying to reduce substitutions as a cost-savings.
3) BoG was a test-bed for cost savings, and it is being taken well by most guests
4) The changes are beginning to be implemented around WDW at TS and QS eateries.
. . . on-line advance ordering speeds up the meal time and increases table-turns
. . . reducing kitchen labor by reducing substitutions
. . . reducing kitchen inventories and waste by not stocking/cooking substitutions
NOTE:
Menu changes due to allergies are on-going and sometimes expanded.
Menu changes due to "picky" eaters are being reduced.
It is good to accommodate.
But Disney does not want the (increasing) cost to be ALL Things To All People.