IMHO I was convinced that MacWorld's days were numbered the very day Apple announced they would no longer participate. With certainty? Well, it was more like an eventuality.
A gross (theoretical) analogy would be like saying "Will NATO survive
if the USA ever pulled out of NATO?" Well, maybe the other member-nations might still hold it together for a few more years, but eventually… it won't be NATO at all any more, and will likely disappear altogether with US support gone."
And don't get me confused with several of the Expo haters in this thread. I have a signed copy of my original Bondi Blue iMac poster… with the signature of comedian Sindbad when I saw him at MW Expo. I'm sure you realize that he was one of the old guard celebs that were frothingly pro-Apple in those days, and would make cameo appearances at Apple events. The only other "Apple signature" I have is that of CEO Gilbert Amelio. Shook my hands and signed autograph for me at MW Expo San Francisco, he did this mere months before he brought back Steve. Amelio was a nice guy, warm and personable. Not a jerk at all. He would mingle and shake hands and sign autographs with the common Mac fanboys in the expo exhibit halls. Jobs would never have done this (unless someone proves me wrong)
I loved MW Expo. But I knew it was going to die the moment Apple pulled out. Oh well.