That may sound good, but is simply not true. We see evolution in action among elephant populations in Asia right now.
Elephants are being hunted for their tusks. Elephants born without tusks, generally at a disadvantage in finding food, are surviving to breed in higher numbers. The tuskless elephants are better suited to their environment, and as a result the population is becoming more and more dominated by tuskless elephants.
Predation is an important part of natural selection. It is through this particular predation that we have an example of "current evolution".
Bah, an elephant with no tusks is still an elephant.
If you shoot all the ones that spend most of their time on dry land, instead of in shallow water, they'll still be elephants.
Then if you shoot all the ones with long trunks, so the only ones that grow up have a short snout instead of a trunk, it will still be an elephant.
Then if you shoot all the tall ones, they'll still be elephants.
Then if you shoot all the ones with small heads, so that only ones with big flat heads are left, they'll still be elephants, even if they look and act like hippos by this point.