We can say in hindsight that the PC would have evolved anyway but when you consider IBM had such low confidence in it that they farmed out the PC's two most critical components to upstart new companies (the microprocessor to Intel and the OS to Microsoft) turning both of those companies into major new corporate powerhouses I am not sure how much longer it would have took.
Considering that PC's have fundamentally changed how we work, communicate, and play I would argue they are actually more influencial than the printing press or at least near the same level of importance.
Also, it is human nature to assign great achievements to one person who gets there first or most publically. So just as Gutenberg gets the credit for inventing the printing press (even though the Chinese had printing for 1000 years before that) and Newton gets the credit for discovering Gravity and inventing Calculus, we can assign the PC to someone. Personally I think it should go to all three people - Moore, Gates, and Jobs. As I said these things are always subjective but the transition of the computer from the isolated hobby of a few long hair types to one of the most critical elements of modern society is a great achievement and deserves acknowledgement ... regardless of who we give it to