Hmmmh, what about Jules Verne for instance, didn't he predict a submarine, a trip to the moon(OK, we didn't actualy use a cannon, but ok), then a hot air baloon and a lot more things that were thought to be a sci-fi. Then, if you look at Da Vinci(helicopter, parashoot,...).
Modern sci-fi(cyberpunk, neocyberpunk) talks about things that are not so far away, and you could easily draw paralels with the things that already exist. Star trek(star wars) is more a pop sci-fi, then anything else, made for masses, but still there are few things that are not so sci-fi anymore:
teleporter - Hmmm, didn't "we" already teleport a photon?
Phasor beam - paralel with a laser beam, that we use in mining to surgery(nothing special actually)
Holodeck - A mix of computer games and VR(huh i can't wait to play Baldurs gate VIII in holodeck
)
k.
