I think over the next year we will see a slow and steady improvment in the number of games for the Mac platform.
As for launching a console, Apple has two businesses which do very well: Mac and iPod. They also have two businesses which they are working to establish: iPhone and TV.
They don't need any other distractions, not for the moment. I wouldn't rule out something in the future (5-10 years, who knows?) but don't expect anything soon.
It is definitely one market they could explore for future growth, along with the enterprise market. Apple (or someone else) needs to kill two properitory Microsoft technologies: Exchange and DirectX. Once these have gone, the window of opportunity will be open.