So now the damage is trivial? Why is it then a minor disaster that it's not automatic anymore?
And 100+ hit points? That would be a level 7 Brute or a level 9 Soldier. It's a freaking first level spell! Of course it's not going to scare the pants of monsters in high heroic. But against a group of level 2 Artillery it's going to look pretty intimidating.
No the damage is not trivial. Wizards who take this spell obviously want to do extra damage. You have to compare the value of the control effect of moving to the damage. I said basic attack because it scales at low levels it is likely to be dice+5, at 11th it may well be dice+12. It is still somewhere around 1/8 of the monsters hitpoints.
The monster gets to make the call whether it is worthwhile to stay not the wizard. The control effect is weak. With a simple slow or wall the moster may get no choice.