Hi Arek,
This is exactly what we think as well. Without an engaged community of quality contributors we won't go anywhere and this is our only priority.
I love your ideas, thank you for sharing them. One problem we face with convincing bloggers is the mental barrier of them thinking that people are just going to read the tl;dr and not the whole content. We believe that the reverse is actually more likely and are starting to aggregate data to back this claim up.
If you are up to discussing intelligent gamification with us, I'd be delighted to have a chat with you. Contact me on twitter @stanmarion or by email stan@<tldr>io
Thanks for the kind words