yep. They should just give up at this point because nothing is going to sit with Alien and Aliens. The time has passed and now it's all just fanfic.
It's also an issue of what's left is there to do?
Alien was a perfect horror film, and Aliens was a perfect action film. Aliens worked because it upped the ante from Alien, which was easy because there was only one alien. If you try and redo the Alien type film, it will just be a weak retread (see Alien 3), and if you try and up the ante from Aliens further you're only going to make it ridiculous and further demystify the alien.
Or, if you try something new with it, you end up with Alien: Resurrection. And at that point why even bother making an Alien film? People see the movies to either be scared or overwhelmed by them.
And based on the interview with Blomkamp, and the concept art, it sounds like he's trying to do all three, which sounds...yikes.