Yeah. Sure. Measles can actually destroy the immune system so that it forgets not only that you have had measles, but everything else you've developed an immunity to (it's called immune amnesia) by having the disease or having a vaccine, and face getting the whole mob again. Or, you could be the 1 or 2 people in 1000 who will die, or the 1 in 1000 who will get encephalitis and live, albeit significantly intellectually and physically disabled. Or you could get subacute sclerosing panencephalitis ten years after you had measles, and that's almost always fatal.
Makes getting shingles after having chicken pox as a kid seem like a walk in the park, mmm?
In fairness to Picketty, he did think we could avoid neo-feudalism if ordinary people set aside their competitive and selfish natures to focus on the co-operation that is at the heart of our success as a species. Funnily enough, Mike Berners-Lee wrote the same thing at the end of There is No Planet B (a book I do wish more of the billionaire tech bros had read).
So, yeah: we're big fucked.