That would be totally unsportsmanlike. Don't think were going to see that anytime soon at least. Maybe if a new, in-your-face generation rises.
I wouldn't call it unsportsmanlike. The Hawk-eye system is there for a reason and the players should be able to challenge anything. Dancevic gained the advantage because the line-judge made a mistake, Ancic should not suffer for his. If the ball is out, then second serve I say.