Responding to this one, but I see what you guys are talking about.
The thing is that teams like Coast/Renegades/Origen are kind of unusual and don't reflect the average level of the CS. What happened to Winterfox seems to be the more common result, and then teams like Fusion and Final Five and Lowland Lions.
I think the true Challenger teams (that aren't superstars just farming wins to get an LCS spot) need something more. Like TDK just got bumped instantly and Giants only barely made it out of Spring Split and that was a tie breaker against MYM. More than 1 split worth of lock in or something.
The thing that bothers me is that one bad split can knock out anybody and it's only a few months of time. So a team like CLG or Cloud 9 can be auto-relegated even if it's something out of their control; think of Hai not making through the surgery on his collapsed lung or Doublelift getting a pinky infection that goes septic. It's an outside thing, but it doesn't make sense to me to have a league that is so unstable.
My personal opinion on it is that the promotion tournament should include the top 3 Challenger teams and the bottom 3 LCS teams. I didn't like the BCS either, fwiw, I feel like if you want the victory you should have to take on all (relevant) competition.