Clean energy for all.
You realize you can already buy one, right?
Oh, you mean your own? Can’t help you there.
Well if we get the second, the first would be a lot easier even if FTL travel is impossible.
Extraterrestrial life. We’ll see it eventually, but the odds of it happening in my lifetime are close to zero.
Nanobots that live in your body, maintain you at a physical age of 18, repair organs which begin to degrade, and destroy pathogenic organisms and incipient cancers. IIRC Eric Drexler predicted this for the early 21st century in Engines of Creation. Maybe in 300 years or so.
Fully-immersive virtual reality which can’t be distinguished from the real world. (mostly for the pornographic possibilities.) VR seemed to be making progress in the mid-'90s but I haven’t heard much about it in a long time.
A cure for cardiovascular disease. I expect eventually a pill will easily keep arteries clear of plaque. I imagine we may only be 30 or 40 years away. Imagine heart attacks and strokes pretty much a thing of the past.
Check out this thing called “oculus rift” sometime. Still very much in beta, but it seems like the tech has finally caught up with what the 90s promised.
I was working in the virtual reality industry about 15-20 years ago and from what I’ve seen of the Oculus Rift, there’s no great improvement in the technology, aside from relatively light weight and higher resolution than we could get in the 1990s. I’m amazed that Facebook paid so much for the company.
Developments in neuroscience that allow us to fully understand how the human brain codes information, making digital communication with the brain possible.
If we get that far, there is no telling what it could lead to.
Followed by a complete halt in human progress as we all retreat into our own virtual fantasy worlds.
Some of us do this already, and special equipment is not needed. 
I’m sad I probably won’t live to see chemical encoding of memories in the human brain, and by extension the ability to upload and download memories to other people.
Can you imagine being able to share a memory? Or download someone elses memory?
I think it would be a game changer!
(Yes I realize this is pie in the sky scifi nonsense no where near reality, sue me!)
A decent web application framework.
What you are talking about might be a century or two away, but the first steps are being taken.
I watched one of Michio Kaku’s lectures on future technology, and he said that researchers in Kyoto have already been able to translate the optic signals of the human eye to a digital format.
So far, they have had a test subject hooked up to sensors and have successfully been able to replicate crude outlines of shapes on a TV monitor of what the test subject is looking at.
That’s along way from translating memories into a digital signal, but it is a step in that direction.
I think it is entirely plausible that we could one day figure out how the brain codes and stores information.
Star Trek style replicators.
Winnar!
Anti-gravity. It is proven to exist in some form, since galaxies are accelerating apart rather than decelerating. I want an anti-gravity flying suit.
Also… the elimination of the penny. Somehow, that seems less likely.
I spent most of 1976 in Africa and the rest in Canada. I almost took up believing in Gold, just so I could thank Him for letting me be out of the country for all the hoopla.
As for living to 108, my mother lived to 98, her last months in my home with me, and that is an indignity I’d rather be spared.
The famous rejoinder is “In the 24th century, everyone will have grown up enough to realize it doesn’t matter”.
You cannot serve God and Mammon.
Think of how this would revolutionize the judicial system.
“Did you kill that man”
“No”
“Let’s go to the tape!”