Seriously? No. I meant lock up and slide, not lock up and go over the bars; when going over the bars you may or may not have locked up the tire, it doesn't really matter. Of course that's easy to do, that's the whole point. The point is the contact patch isn't keeping you from stopping faster, it's the torque moment around the front tire. Sliding back doesn't help enough, it's still the torque moment, not the contact patch.
When you stop your car, the contact patch of the front is what is the limiting factor, your front tires slide and smoke. In a car or motorcycle, since they have such short wheelbases and little weight towards the back, they just flip over instead of sliding.