Yes, down to whether operators are equipped, but also whether RNAV approaches offer any operational advantages over ILS. Tellingly, the framework briefing document for the DTVA RNAV approaches states: "The ILS will remain the primary approach aid." RNAV approaches won't match the current 200ft decision height on the ILS in both directions.
Also "The Change Sponsor confirmed that the procedures were not being introduced to attract growth"