You would only have noticed that something is wrong as soon as you had left the ground effect. Until then you would have used the same Vr and therefore required almost the same amount of runway to get the wheels off. Bouncing back to the runway is certainly not an option once the iron lady tells you stall especially when the plane starts rolling unexpectedly. What makes you sure, you would have saved the day?
We did a no flap takeoff in the sim at SNA (5700 ft) to demo this using flap 11 V speeds. We lifted off late but even with the flaps up did not have any control problems. Of course we didn't over rotate knowing what that would do to controllability with no flaps. The Spanair pilots didn't have the luxury of knowing their flaps were up at rotation.