Therefore a 60,000,000 increase in global population
And its mathematically impossible for each of those individuals to ever own a full bitcoin.
What's wrong with that? It's also impossible for them to have, say, a ton of gold.
In theory it is possible if enough gold can be mined (it is not known 100% where all the gold deposits are). There is however a hard limit as to how much bitcoin can be mined.
I don't think the world population will reach this level as overcrowding and overuse of world resources will prevent the population from getting this large