Until it throws a track, a weapon jams or any of the myriad of things that are common in tanks today, things which need a crew to fix.Name calling is the best response you can come up with? Of course modern war can't be fought exclusively by drones - you need people in many roles. But soldiers on the front lines is becoming an increasingly outdated concept that still persists mostly because of ethical dilemmas and because the decision makers are old men.
For example, the technology to make UCAVs completely autonomous already exists and would quite likely perform better than piloted drones due to lack of lag and human error. The biggest reason it's not used is that it's too "unimaginable" to some backward-thinking people without having ethical debates about it.
What insurmountable technological barrier stops us from making 1000 small drones size of palm with a camera and a small explosive charge each, controlled by centralized algorithm from a nearby UCAV? Self-learning algorithms that we already have are ALREADY better at pattern recognition than humans. That means higher precision, better friend/foe recognition, etc.
Truth is, right now a piece of meat on the front line is the weakest link, the one thing holding military development back. Tanks without pilots could carry heavier armor, more fuel, more ammo. Planes without pilot could increase maneuverability dramatically, since they are no longer limited in g-forces applied to the weak link. But instead of working to eliminate the weakest link, we keep pretending like a war without human soldiers is "unthinkable" because we need our heroes I guess.