Aetheri
W/E happens don't panic...
Making Zelda playable only works if you make her story and possibly even her gameplay, completely different.
Linkle and Aryll work as a female equivalent to Link because they currently don't have a role and backstory in the extended lore of the franchise.
^this...I mean yeah that'd work for me too. I'd actually prefer that as you could really differ the two plots even further and the abilities between her and Link as well.
What I'm talking about, Either you can choose to play as Link or Zelda, and the roles, and gameplay differ depending on who you chose...or giving Zelda the full spotlight in one title...not every Zelda in Hyrule's history has an awakened hero present during a crisis...such as during the Adult timeline during the flood of Hyrule...
or even switch between the two at certain points (ala Medli/Makar or Kafei for example), but with a much more involved playable role than in Spirit Tracks which was very limited...