Homo Sapiens is a successful species, in as much as the species matters evolution-wise. As far as I know, we are have the highest population for our weight class, which means lots of individuals have been reproducing. And therefore, we are a success. We aren't a plague a 'virus' to quote Agent Smith, we are just good at this whole 'be fruitful and multiply' thing. However, neither are we the Big Dude in the
Skies gift to the universe. We are just. . .us. Manipulative (tool using) Intelligence is but one path to success, and as is obviously not a common one. Many species have come and gone, most likely we will too. And I don't mean in some billion of years from now 'Heat Death' type death, don't flatter yourself, it could be in a few million years. Who knows?
We are like the man whose goal was to be immortal. He was asked how that was going.
His response?

"So far, so good."

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