It's immediately apparent that Rooney's role is played for laughs and when I first saw it I found the characterization shocking. The laughs come (or are supposed to) from the exaggerated Japanese stereotype. Apparently Americans hadn't quite shaken the idea that
the Japanese are the Orientals with bad eyesight.
This is a movie just begging for a great remake. Without the censorship, the characters could be played as written by Capote and the original, not so saccharine, ending restored to its gritty and more satisfying result.
What's stopping it? Audrey Hepburn. Had just about any other actress of the time performed the role it could easily be a candidate for a remake. I could be wrong. Perhaps it's already in the works. Yet I doubt it. Hepburn is so radiant, so joyously real yet dazzling that you have to understand they don't make 'em like that any more. Maybe it's a guy thing, I don't know. Hepburn did what Monroe did at her best; fabulously seductive, sophisticated and independent but genuinely loving with a wispy aura of vulnerability: to wit, the perfect woman. She has an angelic quality, very particularly in this film, and that aura was very really translated into her off-screen persona. I don't know that anyone could do it now, stars just aren't like that any more. They're a little duller, not so airy or delicate (ok, maybe Scarlett Johansson

).
The other factor is the setting.
Breakfast at Tiffany's needs a New York of the early 60s; or at least, a pre-sexual revolution New York. The characters need the pressure of the social morals of the times to be played effectively. Now Tiffany's is still there (was there myself last week) and it looks just the same, and it wouldn't take much to make a few sets and pull a few old cars out of mothballs to redo it all. I doubt it would be the same though. We forgive older films for being products of the their age so no matter what the subject, we have to see these films as products of their age.
1960 just looks far away different from the 1940s but remember that only 3 years previous to 1960 did Eisenhower order the army to break the Little Rock school blockade. We have come a long way since then and we still have much further to travel before race isn't an issue.