@Terrificli -- Haven't people always been able to make that argument, though? Perhaps what will happen is that midrange computers will just get more powerful as they tend to evolve right along with personal computers.
It has never been uncommon to find people using personal computers as midrange servers. Still, you've got to believe that midrange systems will become more powerful and allow people to do more things with them than they have in the past.
The problem with defining what a midrange computer is has to do with the evolution of technology. That midrange computer from a few years ago might actually be less powerful than the personal computer you can buy today for about $400. Still, that old midrange computer might still have enough firepower to handle modern programs. That is a major difference. Powerful midrange computers don't go obsolete quickly, meaning they can be workhorses for years.