For one thing, WWHD is a remake. Sales of a remake and sales of a brand new, ground up for the Wii U HD Zelda will be a totally different thing.
For another, I don't think it's "sacrificing anything" to have a realistic style. "Realistic" Zelda is STILL a hell of a lot more creative and whimsical than, let's say, GTA, or Uncharted, or CoD, etc., as far as art style is concerned.
And personally, I thought that Wii U Zelda tech demo's art style and graphics looked a hell of a lot prettier than WWHD's.







