Knut is a lot in the newspapers here- of course he is a star.
I would not be too much worried about that discussion.
Cutie Knut is the son of circus bear who did not care for her cubs- so his brother died. Knut will be a zoo bear- I can understand that if someone thought of putting him in the wild there would be reason to worry for him but he will have his fish (and no chips ) paid for by Berlin city.
There have also been voices saying that polar bears are loners (they don't live in a pack) and he will be happy alone after he is big enough.

At the moment he is just the most cuddly thing around- a pity that Berlin is so far away as he will be out for the public in a short time