I think that in the long run, computers will eventually be made secure. It'll require a mind-shift away from ambient authority, but it will happen. Likely in 10-20 years. At that point, it'll be as safe to run any random piece of code as it is to plug in any random appliance into a wall outlet.

I also believe that computing will eventually outgrow the Von Neuman model of computation for many, if not most, tasks. The idea that 99.999% of the transistors in a computer are just sitting, waiting, will seem silly in retrospect.

I believe that we'll find new deeper laws of physics that allow us to generate energy at a far cheaper, and renewable manner that even fission/fusion are capable of today. I want my personal megawatt box that doesn't emit excess heat, nor use fuel.