Well, Arnold was offered a part in Shane Black's The Predator but was disgusted with the script.
Obviously Alien has gone insane with Prometheus and Covenant, but the ship could still be righted perhaps with somebody doing Blomkamp's Alien 2.5 with Sigourney and Michael Biehn. I'm actually not really sure Blomkamp is the guy for the job, but Ripley and Hicks doing basically what I described for Dutch earlier would be a stronger move than remaking Alien.
I'm not opposed to your ideas of remaking the originals (although I don't think there's really room for improvement the way there was for The Thing of The Fly) but if that were done with Alien, I think it would just go by the wayside like it did for Friday the 13th.