Originally Posted by
vitruvian
To be fair, we don't really know for sure if the individual universes die if their Molecule Men die early. It would be nice if Hickman clarified this point, but I suspect he's moved on from this part of the story. It is at least conceivable that a Molecule Man's universe only dies if that Molecule Man goes off because of the 'fuse' lit within him, not if he's snuffed out in some other manner. It's conceivable, as some have suggested, that Doom and the Swans are harvesting the energy of the 'bombs' for later use against the Beyonders.
However, that does leave us without an explicit explanation as to why killing enough of them sets off the Incursions. Having been introduced so recently to all the universes, it's not like their presence would be integral to those universes or the multiverse, such that their absence should in itself (i.e., without their universes going with them) have any impact on the timeline of the multiverse as a whole. If the universes do go with them (albeit not immediately, rendering them more metaphorical than literal 'bombs'), that would tie in better to Reed's oft-repeated spiel about the early death of a universe (not a person) triggering the Incursions, making it inaccurate only in that somewhat more than a thousand realities needed to snuff it before the 'vacuum' of their absence started crushing other universes together.
But the whole thing about the Beyonders seeing the first dead Molecule Man (and presumably the remainder of them as well) right away, but not figuring out that 'something was very wrong' until 10 years in to the culling of Molecule Men, so three years in with Incursions happening.... that's the case whether those universes died pretty quickly with their Molecule Men (just not soon enough to disallow examination of the crime scene), or not. Both interpretations paint the Beyonders as being just about as oblivious to things. Sure, whole universes going missing might be a bit more conspicuous (although they get culled by the Omniversal Guardian and others pretty frequently too, according to other stories), but on the other hand, the Molecule Men are the Beyonders' special bombs now, so their death alone would be seen as damaging to the experiment.