Yeah, and back in the '80s, 640k was enough memory.
Here's a hint: digital camera image sensors will continue to get bigger. Images will continue to get higher in resolution. Photo editors will continue to combine more and more layers. More and more levels of undo. Image processing geeks will create more and more complex filters. Pretty soon, 4GB will no longer be enough for anybody.
And "pretty soon" is sooner than you think.
correct me if i'm wrong but can't OS X adress 32GB ram already? I think the mac pro can take 32 GB. And my guess is that you won't need more than 32 GB Ram in the next 4 years. By then OS X is 64 bit as well.