The actual next big thing? Not a language. Not some hardware change ( I mean, ARM servers could be big, but only the server people will care. It won't be the Next Big Thing.) Not block chain - that's close to played out. Not machine learning - that's too far along. It's what's now, not what's next.
I see two possibilities. It might be quantum computing. I doubt it, but it might be. It also might be wearable VR. Again, I kind of doubt it, but I doubt it less than I do quantum.
I think the next big thing will be Capability Based Security -- the good kind, not the "allow location access" kind that people confuse it with.
I also look forward to the resurgence of the personal computer.
Stable Diffusion is already making waves in digital art. I expect more specialized models fairly soon.
Free data and services we used to take for granted like YouTube, farming software, and car seat heaters are becoming forcefully monetized. Will we someday refer to these as the good old days when search engines were “free”?
Solar
A way to escape the google silos and protect your private data from mass surveillance, but without losing the usability. Things like locutus, solid, etc.