I've said it before somewhere but whilst I do like the further empowerment that going this direction would give the Predators hunting their own creators, I don't want to see every sentient being in the universe become some sort of Engineer creation. Let's have some unique ones.
A good point and I agree. After all, the engineers 'creating us' by melting themselves on an Earth-like planet (or early Earth) is, biologically speaking, kind of a moot point anyway. All they really did was 'seed' the planet with self-replicating cells, but logically these cells would have to start the entire evolutionary cycle all over again. It's not like they deconstructed themselves to jump-start little humans.
I mean one of the major things evolutionary biology has yet to nail down is the jump from organic molecules to self-replicating cells, and there are several good theories out there, so the Engineer doing that felt almost pointless, like they could've just dumped a dead body down there, and the bacteria would've been enough to begin colonizing the planet with life.
There are ideas in the scientific community about doing this already - seeding a planet with future life by sending a tiny portion of cells that would, in theory, evolve. NASA and other space programs actually take great care to make sure things going to space are sterile so that we don't spread our circus of microbes all over the solar system inadvertently.