I disagree completely - Emmitt did slow D-linemen enough to buy the QB some real time.
Obviously Emmitt couldn't stand those guys up and stop them, but you seem to think Emmitt blocking an oncoming D-limeman was akin to a moped trying to slow down an oncoming train.
If you truly watched Emmitt block and have watched Julius Block you would see there is a dramatic difference.
Making defenders slow a little and then accelerate again makes a big difference - even quick 280 pound guys take a second to reach full accelerate after being slowed even a little.
And often just making enough contact to throw the defender off a direct line to the QB is enough to buy some significant time.
I agree completely that we are letting too many defenders get through the line of scrimmage untouched, but to say a good blocking RB doesn't make a difference is plain false.