I think it’s really impossible to know what is really possible more than the somewhat near future. Let’s just take our current state and look back some period of time and think about it. If we look back roughly 30 years into the 80s, cellphones and pcs were just starting to become something that the middle class could afford. I seriously doubt most people could really even understand what it’s like not just to live in the age of the internet, but to carry around a smart phone in our pockets far more powerful than anything they had then. We have constant access to all the knowledge humanity has ever gained, movies, tv, games, and we can reach anyone anywhere in the world instantly. Perhaps not godlike to them, but probably on the edge of what they could imagine what it could be like to live in the future. After all, seeing 80s sci-fi doesn’t really lead anyone to what we have now, except perhaps Star Trek:TNG.
So what if we go back farther, like 100 years to the early 20th century. The idea of TVs is probably vaguely at their ability to imagine, as they had movies then, but even basic computers is probably nearly impossible for them to even conceive. They had flight, but what we have now is far more advanced. I think if they saw some of our modern technology, I don’t think they’d see us as gods, but they might be lost on exactly how we could have achieved some of these things, and probably shocked that certain other things they might have expected, like perhaps flying cars, still aren’t here.
And say we go back maybe 500 years. These people don’t understand light or electricity, muchless things like flight, computers, etc. I strongly suspect we’ve have trouble even explaining some of the basic concepts to the overwhelming majority of them, not because they’re dumb, but just because it’s so far beyond anything they’d ever experience in their daily lives. Hell, they’d probably accuse us of witchcraft or devil worship.
Anyway, I think my point is, if you go back far enough, we basically ARE gods in the eyes of the people that lived at that time. Hell, we can do more than most of them would even expect of God to be able to do. We can manipulate the genome and create new forms of life. We can fly, have instant access to knowledge far beyond their understanding. If one were so inclined and had the ability to time travel, I believe one could go back several hundred years and pretend to be a prophet or a deity and probably gain a sizable following.
And as we go forward, technology grows exponentially, and there’s no sign it will slow down or stop any time soon. Surely, if we’re gods to the people of 500 years ago, the people of 500 years from now–barring a near apocalypse–will appear as gods to us, probably even much sooner because of that exponential growth. Hell, I wouldn’t be shocked if the lives humanity lives in 50-100 years will be virtually unimaginable to us as we live now. And, even those people will probably just see their lives as pretty much normal; they won’t have these feeling of living in the unimaginable future, just as we don’t relative to our ancestors. And they’ll probably wonder the same we do about what future technology brings, but it will be in the context of whatever amazing things we’ve created since.
And what if something as truly revolutionary as the internet–pretty much not foreseen just how impactful it would be–comes along. After all, I’m only in my early 30s, and the life I live now is far different than I ever could have imagined when I was growing up. What if we find a way to make free energy (or, at least in context, so cheap as to be essentially free), or time/ftl travel, or true artificial consciousness. Something along those lines could change our lives beyond our ability to understand it as we are now in a matter of a couple decades.
So, sure, I do think it’s only a matter of time before we are virtually immortal and omniscient, as least as we understand those terms now. We’re only just now starting to scratch the surface of nanotechnology and the quantum world. I have little doubt that we’ll figure out a way to manipulate the world in some fundamental way that we cannot even conceive of right now.