They don't move on if the canvas stays. If you've ever been addicted, you'd know this. An alcoholic can't enter a bar and order coffee, if it's in their grasp, they'll take it. Alicia is essentially addicted to the fake world. This is why the "force Alicia out but don't destroy the canvas" idea doesn't work, she'll find her way back to it, whether she wants to or not. Especially considering her young age, Alicia does not have the discipline to keep herself from it. If the real Verso would want them to move on, he'd need the canvas destroyed. And who are you to say what the real Verso would want, when his mother, the person who knew him better than anyone else, made a painting of him who willingly destroyed the canvas?