I just finished watching the documentary, and I was quite moved. It brought back a lot of memories.
I have a tremendous amount of respect for these driving forces of the scene. I was happy to see several of them, such as Salamancer and Sideshow, receiving so much well-earned credit. There are many other people as well, from before these guys had even joined the scene, who deserve equal praise.
And that is why competitive TF2 is still around today: because you manage to inspire generation upon generation of player to get involved and continue driving the community. Back in 2010, I was inspired and welcomed to make my own contributions, and although I and my peers may be forgotten, our efforts live on through the people that followed, and are driving the community today. That is very rewarding to see, and I hope that it continues for years to come. What this documentary shows me, is that even if you do not manage to push TF2 to success as a product, the effort itself is pushing you to succeed as individuals - and that holds more value. So keep it going.