I'll speculate, but it is only speculation, and there are many others better informed.
Yes, I do think at some stage Amazon will start delivering kfx via the download and transfer by usb option. I have seen no indication of this, but it does make sense. kfx is now Amazon's chosen format. Many features now rely on kfx. Amazon could have gone another path, but chose not to, for whatever reasons. It is understandable that Amazon would want to give their readers the best reading experience and provide all features, which is why I think it is just a matter of time.
Yes, I do expect that the kfx format will eventually be reverse-engineered and the encryption and if necessary drm "broken". It has simply not been necessary whilst kf8 and other understood formats are still readily available. I cannot guess a timeframe. It would not surprise me to find out that most or even all of the work has been done. However, given the DMCA anti-circumvention provisions and similar laws throughout the world, packaging and releasing such a tool may be problematic. It may circulate privately for some time, though I expect it would eventually make its way to the public. A kick starter or similar type project would be interesting, but probably fall afoul of Amazon's litigation department.
My advice, for what it is worth, is to buy a PW1 or earlier Kindle which supports kf8. I think the earliest was probably a Keyboard, which I think was 3rd generation. This is the most unlikely candidate for kfx support. However, the consensus view here seems to be that Amazon is unlikely to add kfx support to any further devices, so a PW1 is a good bet.
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