Please remove this functionality.
There are enough other ways to get back to lobby.
More and more player raging or trolling are abusing this function especially in lower fractals where people are not experienced enough. And it needs only one more player not looking too closely at end of fractal, or misclicking, or simply not KNOWING for the ragekitten to be succesful.
So please, Anet. Just remove it. Its not needed. In all my time doing fractals, (and Ive been playing fractals nearly daily on one account or another since release of them) I only used this function a handful of time.
And if you dont want to remove it, then please. Change. It. So it cant be used anymore when you reached the end of the fractal.