Well, it helps that most people expected another retro rep, and Sakurai has mentioned that if Takamaru ever got another game, he'd want him in Smash.
Also because Tingle and Impa were mentioned just as much as Ghirahim until very recently.
In the Zelda fanbase? Sort of.
In the Smash fanbase as a whole? NOPE
Heck, Takamaru was more requested than Ghirahim. And I KNOW Isaac is more requested than Ghirahim, and he's not looking so hot right now either.