The biggest reason for reviving the Amiga is as follows: Another open platform that is competitive.
Some people can't remember before Microsoft Office or MS-DOS. The world back then with computing was very new, there was a lot of room for small companies to come in and develop software and become big companies. Today if you do some imaging software you have to be "Adobe" to get noticed.
So why bother with re-imagining and re-inventing the Amiga. Simple, create a new software market for fanatical developers who don't have big money to compete with the Microsoft's or Adobes of the world. Give people a chance to come out with a new direction again for computing, one that anyone can afford to get started with.
The average developer pays Microsoft over $2000 a year for MSDN. CATS (Commodore Amiga Technical Support) never charged people for that knowledge of development or throttled the progress of new things being invented.
Right now if you are in the open source linux world it's getting mighty crowded and not that many new innovations are going to do something cool and new where are you gonna go?
Would you really have an opportunity in the PC market to become a "Tim Jennison" today? Probably not unless some major company bought you out.
The AmigaOne represents an opportunity not controlled by a major corporation a chance for your own manifest destiny..