I my opinion, it's not so much that realistic (though it was never realistic) style would bring more customers, it is that anime style will most likely turn away quite a few potential customers.
To explain it bit better - in target demographics that Nintendo is aiming (Aonuma, GDC 2007), Zelda, which is usually E or E10+ rated, is going against M rated titles...while M rated does not make by any means game better, it does make it 'cooler' in the eyes of teens that Nintendo is aiming at...so, of course IMO, even though Zelda lacks M rated content, 'realistic' art style would at least make a game more approachable for that audience mostly used to that style.
Of course, head honchos at Nintendo maybe decided they don't care about getting that audience anymore, which is by all means fine if they manage to impress some other audience and repeat success of OoT and TWP.







