Here is the big question: How profitable would this be for big pharma if it really worked? If the answer isn't an enormous number, this isn't going anywhere beyond the researchers who published their work.
A bit socialisation of health care for some but the benefits to the economy may well be worth the trade alone, never mind the individual benefits
[0] https://www.alzheimers.org.uk/blog/how-much-does-dementia-ca...
"If "x" % of the population has their life is extended an average of "y" years, how much more does that cost in pension payouts over the life of the individual vs the medical savings from curing Alzheimers?"