Predictions are tough, especially in the technology business.
There are some indications as to where the Internet is heading, but I'm not willing to put any money on it. In five years, PCs and Macs will still be the primary way we use the Internet. The only thing that will change is that many of these systems will be wireless, using the airwaves to send and receive data. Wireless technology has accelerated from a crawl to a fast jog in the last 18 months with new products that show lots of promise. Look for these to hit the handheld digital assistant market first, catch on, and then move to laptop and desktop PCs.