The Blue Angles Model: Attracting and Retaining Top Talent
You set up an elite team of developers, but, like the famous Blue Angels, you force people out of it after a time. This prevents developers from stratifying, and also gives everyone at the company a shot at making the team next year.
It's an exciting way for a large company to both foster excellence and spread that expertise back to the rest of the company. This is an idea worth pursuing.