Drinking more milk will not make kids healthier, with or without sweeteners. They're not baby cows.
This kind of stuff bugs me.
First, until modern times, babies were nursed much longer - until they were like four. How many babies do you think are nursed that long? not many.
Second, for a big portion of Eurasian descendants, they had a mutation that allowed people to drink milk (as all people were lactose intolerant). This gene change is extremely recent (like EXTREMELY). But it helped survival so much, that it spread very, very quickly.
Before the mutation and in parts of the world that didn't have the gene mutation, humans found ways around it - kefir, cheese, yogurt - things that took out the lactose to make it available for all populations.
It is the dairy from the animals that has helped us grow in population. While other things might diminish, the milk was there and was replenishable. And they are still trying to figure out why milk in it's raw form was even more beneficial to health - which it had to be to spread so quickly.
Now, do we NEED milk? No, we don't. But to say that kids don't need milk and that we aren't baby cows is going a bit too far. Without your ancestors drinking milk, they probably would have perished.