The Architects originate as a cult focusing on making a literal personification of War, one of many such groups. All the rest die out from lacking links in the chain or ultimately shriveling up with money (not necessarily without leaving their own legacies, however). The necessity for warfare and the ability to find both the wealthy and the desperate (as well as reliance on the nastier elements of cross-time travel from the first) enable the Architects to ultimately make their metanormal God-Being. This in turn leads me to a simple kind of LULZ question that's semi-serious:
Assuming we do discover the existence of other dimensions, and assuming that what works in those worlds works in others just like it does in theirs, what responsibilities and dangers would genuinely exist in such scenarios? How much risk would there be of discovering a world where it looks like everyone's happy until we realize we've encountered something like Airstrip One or the Domination of Draka? Suppose likewise that some hypothetical world that's much more utopian in a literal, genuine sense discovers ours and decides to do the cross-time version of a mercy kill? How would we defend against that?
It would seem to me to be certainly an interesting political idea to explore, not to mention the religious ramifications of being able to walk between worlds and discover other dimensions. Suppose that we discover worlds where neither Christianity, Judaism, nor Islam survive and instead Earth is ruled by Indo-European religions? Or for that matter suppose we discover that in the great majority of Earths humans never existed at all. What would we do with such "barren" Earths were we to encounter them? And at the silliest end of the idea, suppose we meet up with sapient tyrannosaurs from another world who discover Earth inhabited by soft things with fuzz on their head and how they would react to us and we to them? ;P