Yes. Apple will eventually come out with a new product that is more advanced. They spent tons of money buying shake from its original developers.
Anyways, learning the art of high end compositing is what is important. The knowledge is transferable into many other compositing programs. ie. Combustion, etc.
For more info on way(s) to learn shake, visit this thread:
http://www.fxshare.com/boards/index.php?showtopic=224228