How are those polar bears and penguins actually faring?

Excerpts from this post:

In November 2007, he [Dr. Mitch Taylor, Wildlife Director with the Government of Nunavut] commented: “I really think that the amount of seals seen and seal kills witnessed (or almost witnessed) means that the ringed seal population in Hudson Bay is huge right now, probably well in excess of the last estimate of nearly half a million. Considering we need about 10,000 ringed seals to feed this population of bears, the bears have a good start.”

It seems the bears aren’t really struggling at all, in fact they are thriving.
...
Penguins are now enjoying a population boom. Their increasing numbers can be partly attributed to the over-fishing of baleen whales in the past which has resulted in a super-abundance of krill, a key species in the Antarctic ecosystem. In addition to krill, penguins feed heavily on fish, squid, and other small crustaceans.