Seth Godin said recently that we need the drive to want more and to be better. Our businesses and indeed our lives would be no fun if we knew we had achieved all we could, and that there was nothing more.
The will to win, the excitement of the game, and the reward of getting things done are what give me satisfaction, and I guess you feel the same.
What if we thought that we had achieved all we could? It would be so depressing having to have to sit on our hands, having no new ideas. That would be the decline and fall of our businesses, and if everyone caught the mood, the end of the world as we know it.
Have you read The Time Machine, published by H G Wells way back in 1895? In his story, in the far distant future everyone felt that they and technology had got as far as was possible, and there was no more incentive to be creative. Civilisation was apparently in terminal decline.
The moral is that fulfilment is in our work, or if you prefer, the game. It is not about achieving some ultimate goal, but in our journey getting there.