If the guy in the rhs calls go around then you must do so - there is no time for discussion. If you do not have enough fuel left to do so then the Captain would have briefed that fact and there would be no decision to make (God forbid).
To you FOs - low hours or otherwise - if you decide a GA is the only option then please CALL IT - talk about it on the ground later. At worst you will look a prat, at best you will save your life and everybody else's on board.
That's my 5 penn'orth, goodnight.