As far as I'm concerned if Andy wants a logo, he can have a logo. Andy has won two majors and an Olympic gold. If he wants to stand on his head and hold the racquet between his feet whilst whistling Flower of Scotland between points, that's fine as well
It's not Fed's logo that annoys me. That's all about branding, marking players as different from the pack if you like. That doesn't bother me one way or another. What annoys me is that some of Federer's fans think they are a cut above simply because they wear the logo, in other words, they are logo snobs.
Andy won't change no matter what he does, but he's right to use his name to improve his earning power if he has the opportunity to do so. After all, hasn't he worked to be in this position? The danger is that his fans will change in one way or another, because they will get ideas above their station, or they'll look down on Andy for appearing to give in to commercialism.
Personally I think something like an intertwined capital A and M, or maybe incorporating the whole 77 thing on to his kit would look quite good, as long as they use a decent font. Something sharp and strong would look good. Something too floaty, like that RF thing, would look naff.