Ive turned Apple products into a thing of beauty. He basically put the beauty, awe and wow factor into Apple and is largely (if not mostly) responsible for Apple's success during the last decade. Jobs is a great man, no doubt (I mean he's done great things) but Ive is legendary.
My take, if Jobs died or left Apple they would continue as they currently are after an initial shock period. If Ive left however, Apple would be dead.
Think about it. He pretty much CREATED the iMac. The very first one was his design and he's been designing them ever since. Same with the iPod. Same with the iPhone. Same with the iPad. All his designs. Even the current Mac pros. Now, before Ive I would have said Apple computers were pretty plain. The only thing that really stood out was their OS. Since Ive, I'd say every little piece of an Apple computer contains the wow factor it all just works flawlessly well together.
Ive seriously doesn't get the credit he deserves. It's always Jobs people talk about, but Ive is the TRUE mastermind behind Apple imo.