I don't think Steve Jobs made iTunes visuals and Apple will still make products. Time will tell how this will affect them. Obviously it's a blow but I wouldn't jump to think a deadly one.
RIP Jobs Funny article here: http://www.theonion.com/articles/last-american-who-knew-what-the-fuck-he-was-doing,26268/ iTunes visuals are ok, but what if you want REAL visuals I suggest you go to this website and download the program http://electricsheep.org/ The site's a pain in the ass but it's well worth it. Basically people make their own fractal AVI's and upload them, then the program continuously downloads them(unless you set a space limit of course, in which case it will replace the oldest with the newest). Then you run the screensaver and wahay! it's trippy as shit You can also download packs with a load of the visuals in to get you started, otherwise it takes a while and you only have a few that loop
He helped set a standard of quality in making a product, especially a technological product. A powerful system, capable of doing 1000s of functions, all in an aesthetically beautiful, hand held, easy to use device. That applies the highest in Art, Technology, and Human Relations to make something like that. Steve Jobs once did acid and you see the psychedelic opening of ideas in his protect. Everything flowing together beautifully in one majestic system, able to adapt to the coldest of thoughts to the warmest of heart. Something beyond what is seems to be. Steve Jobs has always been a great inspiration and wherever he is, I wish him well. RIP Steve. Your spirit will always live on.