Genghis,
Some facts first:
Boeing recommends a rotation rate of 3°/sec. On the 738, liftoff under normal conditions occurs at around 7° pitch. For optimum takeoff and initial climb performance, a continuous(!) rotation toward 15° is recommended. Aft fuselage contact occurs at 9,2° with struts compressed and 11° with struts extended.
Considering that before you react you have to realize that something’s not right makes the rotation of a tailstrike-prone aircraft a delicate manoeuvre. Under normal cirumstances, you have enough time to react - if for any reason the airplane is not airborne by, say, 8°, rotation is slowed down or even stopped until liftoff. You might see another 1 or 2°(overshoot), but at this time the struts are extending anyway, so no probem there, although from outside it does look close.
Now, if due to misloading and/or mistrimming the nose starts jumping up unexpectedly a couple of seconds before “scheduled” rotation with a rate twice or thrice as high, you can easily figure the outcome. And if you’re unlucky enough and have selected full thrust/bleeds off (even more pitch-up moment), it may be too late by the time you react.