I'm not sure where I stand on the change.
If I was making a wizard, I wouldn't have chosen MM, not even if I was human and could choose three: Thunder Wave, Winged Horde take the first two without a doubt for me... and MM just doesn't cut it for the third.
As an automatic damage dealer, does it become interesting to me... as a third for my wizard... maybe. If I'm blinded or the target has superior cover etc etc an auto hit is handy.
Is it how I would have changed the power to make it more attractive and 'old school'... umm, I don't think so. What about just 3 attacks that do 1d4 damage. If all three hit add Int Dmg. If all three miss do INT damge. Feats could allow to choose seperate targets for the attack. I'm no expert. If that is overpowered then 2 attacks, a third at lvl 21?