I bet the iconic blaster seen in countless sci-fi films becomes a reality.
Seriously, a real blaster that may be just a simple railgun at first firing very small particles at super high speeds to possibly something from Star Trek.
Or better yet light sabers, of which I would rather have.
Its only a matter of time, and not centuries of time before these weapons become a reality.
Not a chance. We haven't even developed a practical electric vehicle, yet.
A man-portable power source capable of generating the energies needed to make something equal to even the common rifle isn't even on the technological radar screen.