This is most likely not expected in the very near future. Of course, the statement about the ideality of the human body is purely subjective. Yes, the human body is universal and has a strength incomprehensible to technology, but does not have highly specialized functions and complete replaceability.
However, if you put as much into science as goes into the defense industry and scientists in this area will work with Stakhanov standards, then after a certain amount of time (~ 400 or 500 years) all this will be possible.
Direct connection of electronics to nerves without sensors and decoding devices. No, there is no need for a "translator" - the electronics must "speak" in the language of biological signals, then there is no need for a "translator". We throw it out!
No drives! Absolutely no drives! They are awful aesthetically and ineffective (low efficiency, low controllability). Everything has to work on carbon nanotubes. No to antediluvian technology!
No number! Everything should work "on analog". This will greatly increase the compatibility of electronics and the nervous system.
It is not necessary to "digitize" consciousness, but to make an exact copy of the brain. It is most likely impossible to "digitize" it at all, and even if it succeeds, for the human psyche and psychology it will be something like the Big Bang. The state of Mu, in which the patient will be during the transfer, will greatly help in the transfer of consciousness. The state of Mu is, for example, the state of a computer cut off from power.
You may not get rid of diseases. Phantom diseases that cannot be cured will continue to "hurt".
I do not know how soon, but personally I will be engaged in augmentation of the human body after I finish my studies. And I plan, at least in my lifetime, to at least raise my hands to a superhuman level, add several senses (in particular, electrolocation like in sharks), replace the heart with an autonomous pump (which is already being done, I just want to bring it to my mind) and expand the spectrum, in which a person can see. In principle, a lot can be replaced almost without problems, because the human body is perfect only from a subjective point of view. The main technical problem is brain replacement. Because if we assume that we have fast enough computers to scan the brain and simulate it productively, then there remains another problem: it won't be you. That is, your complete copy will live in the computer, and you will remain in your body. I had an idea to gradually replace biological neurons with artificial ones, while they do not carry any charge, but this is more from the science fiction section. The topic of the spinal cord is also very difficult for me personally. But this is solved by the acceptance of a person with a special education into the engineering team. So, prostheses can be connected directly to the nerves, without special sensors, which will speed up the performance. But I would like to go straight to the spinal cord.
After such transformations, you will be immortal. More precisely, to shoot through your hard disk and kill you will not be a problem (if it does not sync with the cloud), but you will not die for sure from illness or old age. And I suspect that not only I will be doing this, but I do not know about others.