I find it very hard to believe that profits are so slim at Amazon that they simply cannot afford to migrate existing employees to something new with growth potential. Where I work, an admittedly very small company by comparison, there is an active effort to hire people that want to stick around for the long-haul. Sure there have been several missteps in product divisions, but as long as the employees involved are at least somewhat competent then there will always be a place for them to work on something. The benefit to doing this is that it creates a culture where everybody working there legitimately wants the company to succeed, and they're not thinking about it as merely a step in their own career path.