Orion as a non-starter
Yes it is but serious space travel in general is a non-starter as well.
It will take a sea change in atitude to get anything done in the next century and such a sea change could re-open the possibility of Orion. I'm not predicting it, just saying it is possible
As for the rest of it you are dead right. We are no closer to anti-matter drives and 1.0 lightspeed than we are to warp drives and artificial gravity