I'm all in favour of the tubes. My partner is not. If you don't know, then your fate in the system is left to others. The AHD won't give you your wishes but it at least tries to address them.
If you think the future will bring amazing medical breakthroughs and immortality, then tubes is only temporary and all you gotta do is hang on long enough.
I'd say don't bet on it.
The changes to life expectancy and quality of life from early low hanging fruits (most of which weren't even that advanced, like clean water, washing hands for surgeries, basic antibiotics, etc.) dwarf later developments such as heart surgery, bionic limbs, and advanced drugs (aside a few important breakthroughs for people affected with specific conditions).
A more realistic outlook is whether you think you might eventually get out of the coma -- which does happen.
Perhaps I'm just unimaginative, however I can't really fathom a world in which it would make economical sense to cure the ill rather than simply prevent people getting sick. Economically those with illnesses and/or genetic conditions (myself included) unfortunately seem like a bit of a lost cause.
As for preventing people getting sick—well, from what I've heard, a significant reason older people are more likely to get cancer is that their immune system and their body's ability to repair itself are weaker (and one part of cancer is DNA damage), so it seems like the most likely approaches to preventing cancer are also going to help with curing other illnesses.
There is more to life than money. There is more to humanity than capitalism.
I have Sarcoidosis, a genetic condition that means my immune system literally attacks my own body. It's extremely rare. Should I demand that a hugely disproportionate amount of money be spent to cure me so that I can enjoy this theoretical immortality? Seems a bit selfish. That money could presumably be spent to benefit many more lives beyond my own.
This isn't pro-capatilism reasoning, it's just being realistic and reasonable.
EDIT: To clarify I'm not advocating that we don't invest money in treating Sarcoidosis (or other rare conditions); right now it's much more realistic and more likely to cause immediate benefit than immortality moonshots! However, down the track perhaps the best investment would instead be prevention in newborns. In which case I'll miss out. A shame for me, but if that happens to be the approach that's going to have the best net positive outcome for society, then go for it.
However, we live under conditions of extreme supply for many things, including most factors that would inhibit healthcare. We rarely need to choose.
And until then your whole existence would be confined to perpetual pain. This is the stuff of nightmares.