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Something can be possible, while still technically not feasible.

I agree our knowledge currently is lacking, but see no reasons why this will never catch up.

There are fundamental limits on cognition. For one our universe is limited by the amount of computing energy available. Plenty of problems can be fully solved, to where it does not matter if you are increasingly more intelligent (beyond a certain point, two AGI's will always draw at chess). Another limit is practical: the AGI needs to communicate with humans (if we manage to keep control of it), so it may need to dumb down so we can understand it.

Even an AGI as smart as the smartest human will greatly outrun us: it can duplicate and focus on many things in parallel. Then the improved bandwith between AGI's will do the rest (humans are stuck with letters and formulas and coffee breaks).

Manually deployed atom bombs and malware can already wreck us. No difference with autonomous (cyber)weapons.