Did you actually have to quote the entire text to make one comment?
And yes, you are right about the whale: Their ancestors did 'climb out of the ocean' and returned there. (There were a few hundreds of millions of years between these events though.)
What about penguins? They 'climbed out of the ocean', became dinosaurs, started to fly, lost flight, and evolved an aquatic life style. Hahahaha, those crazy penguins just don't know what they want!
This illustrates my previous statement that evolution is not goal-orientated.
Little note on the side: Dougal Dixon, a biologist and illustrator, (and who worked on Animal Planet's The Future is Wild ) made an illustrated book called After Man. In this book he explores evolution and 'predicts' what evolution might do to animals, millions of years in the future.
The book features some beautiful illustrations on what penguins might look like, 50 million years in the future. Several meters long creatures with beaks that evolved to catch entire mouth-fulls of seawater, to filter out small fish or plankton.
I myself have done a bit of photo-shopping and drawing too. Here is my prediction of what the future could holds for us... (It's far from finished, but I don't have the time to work on it often.)
http://helix.myphotoalbum.com/albums.php