I would say your odds at this weekend's 649 are a little worse Ryan - but not by much. You'd have to know somebody REALLY well for you to  get a chance to open your mouth.
Designers slog for 8-12 years or more with three or more published titles under their belt and a stint as a lead designer to be in the position to have a realistic  chance of doing this. The injured feelings an outside idea would incur at any dev shop would be ... significant, in my view. 
Pitching to a start up? Might be different. But it's a serious uphill battle.
Now - if you have a great and innovative tech demo, that might change the equation. But solid tech demos, say Project Offset style, or similar, these days are quite significant and expensive affairs to create.   
Not going to happen, in my view.