Being serious for a moment. Ignoring the Amiga aspect for a moment.
What would I like from a next generation computer? Probably a better way of interaction. While the keyboard and mouse remain the best way of getting data in and out of a computer they are not intuitive or natural.
Suggestions:
Multi-Touch screen.
Speech & Handwriting recognition.
Optical control interface. (The computer tracks eye movement perhaps with aid of glasses or a Monocle).
Neural interface ;-)
I worked on an optical control interface at University (decades ago). The system used a high resolution camera embedded in the screen to digitise the position of your head and the black and white of your eyes. It worked fairly well. I was surprised the Uni never tried to sell it!
The idea was for quadriplegic computer users.