There's two issues, success rate (about 5%) and time ... even if it is successful in humans, it will be 5 to 10 years before it's available (and 20-30 before it's affordable)
This is not being a contrarian, but a realist.
> and 20-30 before it's affordable
Not if pharma execs and shareholders have anything to say about that
To be fair, this same realist perspective seems to suggest humans would not have been capable of developing a COVID vaccine for 5 to 10 years; yet, they identified the virus and authorized vaccine use within eight months.