Imagine in the near future [+] when telling someone they have cancer is the same as telling them they have strep throat: a minor inconvenience. We're still in the dark ages of treating cancer (ie radiation, chemo, and surgery).
You could be right; it's totally possible that in 20-30 years telling someone they have [antibiotic resistant] strep is the same death sentence as telling them they have cancer.
We'll be eating genetically engineered meat. As in lab grown muscle tissue, no need to even raise and then kill a cow. We can use the land reclaimed from animal husbandry applications.
While this is probably (hopefully) an exaggeration, I think you're dead right. The downvotes seem reflective of a delusion in the tech community that we will find a technological solution to any and all of the global problems we are likely to face soon. I wish people were more concerned about this.
If you think sea level rise is the only problem and, if it were, you think 10m is not enough to lead to complete societal meltdown in some places, then we clearly need more hyperbole.
[+] 20-30 years