I do think that we'll eventually see digital amps become the standard - the energy efficiency improvement solves a number of pesky problems (size, heat, weight, electrical consumption) too conveniently for it to not catch on at some point. On the other hand, it's still a young technology that is trying to compete with a very well-established technology. It'll be a lot of years before I expect to put digital amplification in my system since the pesky problems that it solves aren't actually bothering me at the moment and the solid state amps that I have are doing just fine. Give it a few years, though, and the prices should drop at the same time the performance consistently rises to make digital amps something I'd consider recommending to someone else who was just starting to build a system.