I went and scanned through that speech by Crichton...............meh.
He seems to make a lot of statements with out backing it up with much.
His statement on the book Population Bomb was just weird. You would get the idea from what Crichton said that the world population has been going DOWN since the 1960's. Obviously that is not true.
The National Parks were "managed" the way people of that day thought things should be done. There was little to no science involved in the decisions made. Which is why they killed off the wolves, not knowing that they play an important role in the ecosystem.
I believe that the methods used today to manage Parks is quite a bit more advanced.
If anything the reintroduction of wolves to Yellowstone has shown that they in fact do balance the ecosystem.
The other human related problems with wolves is a different issue.
Now if you are just worried about keeping the elk or deer populations as high as possible for hunting purposes.....then yes wolves would be seen as a problem.
However, if you are looking at creating a healthy whole ecosystem that is self sustaining, then ALL fauna and flora that originally existed in that ecosystem are important.