Embedded systems of critical importance

is curing diabetes even possible
i thought it was like cancer "you get it you have it for the rest of your life" type shit

IF you improve your life habits you can make the symptoms go away, i.e. the damage it could do to the eyes and extremities etc. it would come back if you started consuming sugar and not excercising. Type 1 diabetes aka congenital diabetes can't be cured though, unlike type 2, which can be tamed like aforementioned.

all sorts of fail safes built into these

Depends.
Type 1 diabeetus is likely impossibru as even if you managed to somehow clone and reattach langerhans islet cells inside the pankreas they'll get wiped out by the immune system before long.
CRISPR/Cas might open the way for mass gene editing which could even allow one to alter the patterns stored in memory T lymphocytes through pill ingestion, but at that point man may as well resign himself to his fate as a biological botnet.
Type 2 is "curable" through avoiding saccharides like the plague as it is caused by an overabundance of sugar inside cells, leading them to shut down their saccharide carrier proteins to avoid overheating from taking in and digesting too much sugar.

Type 2 diabetes = an overworked pancreas = curable with lifestyle changes and is typically caused by poor diet and lack of exercise (although there are always rare exceptions to this)

Type 1 diabetes = autoimmune disorder = currently incurable. It's caused by the bodies immune system actively attacking beta cells in the pancreas and people are typically born with it if not get it early in life. You can't just add more beta cells because the body will just attack those too. You can't compromise the bodies immune system to not attack beta cells because that's the antithesis of a cure and doctors aren't keen on giving patients virtual AIDS. Another problem is most funding to "cure" the disease is being funneled to big Pharma to come up with "treatments" instead of an actual cure (aka "BUY MORE EXPENSIVE SUPPLIES OR YOU DIE GOY!")

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It is not unlikely for such a scenario to happen on a wider scale.

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No, most of it runs on Windows XP. It varies by countries and regions but most medical computers aren't really secured beyond whatever's enforced on the local network. They depend heavily on blacklisting known bad sites and securing other networking hardware like routers because it's cheaper than upgrading every Windows PC in a hospital. You should also keep in mind that most of their stuff runs on standard Intel hardware in the form of cheap office PCs or embedded industrial boards. These things are usually a decade old at least and don't get proper microcode updates and BIOS patches. Windows XP and 2000 obviously don't get patches so this leaves them vulnerable to stuff like Meltdown and Spectre.

The software situation is a lot better for those things. In cars, planes (civilian and military), tanks, rockets, and nuclear power plants, they often run a microkernel RTOS such as QNX or INTEGRITY-178B. These systems have self-healing properties due to their modularity, they never have to go offline even for kernel updates, and device drivers can be run in outside of kernel space for additional security.

But hardware is a different story. The US DoD in particular has had problems in sourcing components for weapons systems, especially for the embedded computer systems inside them. Often times they'll end up with cheap chinkshit parts that are 10-20 years old that have been sanded down and repackaged as new. These parts might pass initial quality control testing but will fail at unknown times in the future within the service life of these pieces of equipment. They're ticking timebombs that could bring entire weapons systems down. This could lead to soldiers and civilians dying if weapons misfire or don't fire at all.

Technology is far from perfect and most things we'd consider super advanced are really held together by duct tape and hanging by a few strands of yarn.

can someone tell me if 6502 is still being used today and if yes what for ?

Everything you can think of, from keyboards to ovens. It and its rival from the other big ISA family, the z80, are probably the two most widely produced microcontrollers in the world today.

I honestly cannot tell if you're kidding or you're serious. Aren't 6052 and Z80 really old architectures? Are chips for them even made anymore when we have newer ones like AVR, PIC, and ARM?
It just seems weird for them to be still in use today, i don't see them out of hobbyist projects