These are fine arguments, but they all take the inside view - focusing on particulars of a situation, not finding big robust reference classes to which the situation belongs.

And in any case you seem to be arguing for such inventions not being prohibited by laws of physics more than for them happening with very high probability in near future, as many here believe. As a reference class, things which are merely not prohibited by laws of physics almost never happen anyway - this class is just too huge.