You guys have not come up with something that is more terrible than nuclear weapons and is at the same time more usable in war than they are. As I said before, there are things more terrible than nucleus weapons. So I will give you just one, directed artificial life. Directed Artificial life is similar to but not the same as biologic weapons.
There are many reasons that biologic weapons are not very usable though they are terrible. First, they are not vey discriminate as to recognizing who is or is not the enemy. Two, they often come back and hit you own people. Three, the enemy can always retaliate in kind. Four, they are almost imposable to neutralize after hostilities are over and can persist literally, forever. Six, is that the propaganda and moral aftermaths are so great. Assuming you still want to live in the world after the war is over, win or lose.
The solution is to create a new form of artificial life not found on Earth. One created in the laboratory, it would not use DNA or RNA as its information carrying or transcription molecules though it could still use other components of natural biologic systems. This is important. One of the reasons that biologic weapons are not useful is that they are base based upon a system of information retention, replication, and propagation (chaotic) that is not only susceptible to mutation but in fact counts on it as a method of adapting to new environmental circumstances that otherwise would terminate it. DNA does not want to be terminated.
One of the methods by which it does this, especially in microscopic life forms, is that they will exchange DNA sequences with other organisms within their environment building up their viability. In an artificial life form created from scratch there will be no wild forms for it to interact with in this uncontrolled manner. All so,all natural informational sequences always have inactive sequences within them as a product of being a chaotic system verses a fixed designed one. The junk DNA that which is not normally active within the genome is however, still available to becoming active or partially active, this too has a tendency to make the genome unstable and thus uncontrolled. A designed system would, if designed correctly, however not work even if just one instruction was misspelled and so would then self-terminate.
A designed system could be instructed to replicate a fixed number of times and then self-terminate so as to become inactive after its usefulness was over. It could be designed in such a way that if it encountered another artificial life form that was defective, "defined as one that is not behaving as it was programed to do", it would act to actively destroy it, as another safety feature.
Now to the issue of specificity, just because it does not use DNA or RNA does not mean that is could not be made to read DNA sequences and identify certain phenotypes. If you select only specific DNA sequence to trigger its kill mode, you can not only targets specific species but also identifiable sub groups within that species. This could be used to attack food sources or even more monstrously, certain races of people as identified by their common phenotypes.
These phenotypes are ready known and are in data bases right now. There is always some part of any population which are atypical. So it wouldn’t kill every one of the targeted sub-group but easily 80% to 95%. Also it would still kill some of you own people if there was not a way of giving it an off switch. This could be done by programing it to identify a certain antibody in the blood. A specific antibody made in the human body as a response to a harmless protein which is not found within nature this will be your kill switch. When you inoculate your population for all of the regular diseases you just include this protein without anyone knowing about it. The body makes antibodies to all proteins that are not of the body itself and they circulate within the blood to act not as an antibody normally would, but to be identified as an off switch.
Artificial cells have already been created in the laboratory. They used DNA like molecules but there are other easier choices. When this line of research is pursued and it will, for very practical industrial reasons. It will be pursued for the very same safety reasons that biological weapon are so feared but to still do the things that biologic systems do so easily and cheaply. Everything I have proposed will be not only possible but inevitable.
Welcome to the new world!