If an attacker had the ability to overpower you and take your gun, he probably had the ability to kill you anyway.
In any case, training gives you another the best chance possible to deal with the situation.
I've been through the situation. For me it just took time. In the meantime, I got my permit, started carrying, took whatever training I could afford. In my situation, the wife was more worried about me thwarting an attack and being put in jail for it. My response was, "So you'd rather I was killed than in jail?" She's still not crazy about it.