Given the other signings we've made this window, if we lost Bale and got Lamela, I wouldn't hate life. Having Bale and Goaldado obviously gives us two very potent options to put the ball in the net that having Lamela wouldn't necessarily provide. That being said, if it was Lamela instead of Bale, I'm sure someone else (Lamela included) would step up to make up for a majority of those goals we'd be "losing" with Bale gone.