I do think Blomkamps Ideas could be interesting.... the MAIN thing is Re-Introducing the Xenomorph...
With the Franchise we had to wonder WHY the company would Pursue Ripley in ALIEN 3 the only Logical Conclusion is there was NO other way to obtain a Specimen Elsewhere, which means the Derelict and Cargo is DESTROYED and their are NO other Xenomorphs within the Vicinity of Space that Mankind had explored...
The Prequels Muddy this a little as we know the Xenomorph Origins/Related Organisms had likely Originated on LV-223, there would be remains of them on Planet 4 and likely Origae-6 by the time we get to ALIEN in the year 2122.
So we had to ASK why does the Company choose to only Pursue the Derelict Cargo, which we assume after ALIENS leaves only the Queen that Ripley is Gestating as the ONLY source for the Xenomorph?
Its it likely that those other avenues (Planet 4, Origae-6 and LV-223) are all Eliminated and Bare NO Fruits?
so with Blomkamp he had to look at HOW to introduce the Xenomorph again.... does he go and obtain it from LV-223? or come up with some other WORLD where the Xenomorph could be FOUND? But exploring these Avenues could have Conflicted with what ever Plans the Prequels could have had.
He could have gone the route that the Derelict was intact... but they would have to then deal with the Derelict and any Xenomorphs that are experimented on and acquired because by the time we get to Alien Resurection, it has to be that there is NONE of those left, leaving only Ripleys DNA as a source to obtain the Xenomorph.
So again potentially conflicting the Franchise..
Which is WHY a Alternative Sequel to ALIENS could had been the answer, and it appears this is what ALIEN 5 ended up looking like, where it would merely offer a FORK in the Road.. where we have TWO Alternative Roads after ALIENS.
Alien 3 ==> Resurrection OR Alien 5 and what ever comes next.
So this could mean accepting ONE means the other Route is NOT Canon... but it could be enjoyed as looking at it as being given TWO Alternatives to Enjoy...
I HOWEVER think they could have done a Literal Alien 5 by following the Same Path as Alien Resurrection... which would be to OBTAIN/EXTRACT the Xenomorph DNA from Ripley 8
During this pursuit it could take many attempts to extract a PURE stand of Xenomorph DNA which leaves room for many Mutations/Hybrids on the way to a PURE Xenomorph and then experiments on this PURE source.
A Plot like this does-not even have to have Ripley 8 it could be set Years after Alien Resurrection and reveal a Sample of her DNA had been obtained either from the Wreckage of the Auriga, or had been obtained before the Auriga Crash... or even from RIPLEY 8 at some point after the events of Alien Resurrection.
This is the PATH i would take with a Alien 5 if they ever chose to do so... i even had expanded on this last year with a Plot i had for such a Alien 5