1. The "streaming games" concept crashes and burns when Google gives up on Stadia, probably around 2025 or thereabouts. People simply don't have the internet to support it, and Google's infamously short organizational attention span takes its toll. It might come back, but check back in ~30 years when everybody has gigabit or better.
2. One of the big public cloud companies either stops doing public cloud stuff or that business unit gets acquired, and I think the victim will be GCP. Microsoft seems safe with its government contracts and name recognition.
3. Some nasty new nasty, globally-agreed-upon legislation comes out that effectively cripples cryptocurrency for legitimate uses. Bitcoin burns as a result, but overall, it's about as effective as the war on drugs, and some privacy coin like Monero or GRIN has its price skyrocket as the new go-to for otherwise shady transactions.
4. Politicization of everything finally reaches a breaking point and most people check out. It once again becomes a faux pas to bang on about who you're voting for and why at the family dinner table.
5. One or two large social networking companies go belly up or are acquired and unsuccessfully restructured (think Tumblr). Probably Twitter or Reddit.
6. VR grows and becomes a stable "third platform" rather than a mere niche. Facebook/Oculus proved the market demand, and standalone headsets from various companies pushing their own walled gardens come and go. Oculus becomes the market leader in this category. Valve leads with the "cadillac" PC-connected enthusiast hardware. No major quantum leaps - quality slowly improves, but no full dive or anything like that. At least one AAA game is released VR-exclusive and posts good sales numbers.
7. Full legalization of cannabis for recreational uses finally happens. One or two states hold out and keep it illegal or greatly restricted within their borders, but most states notice the tax revenue being left on the table and finally relent, and as more and more states decriminalize or legalize, the federal ban is finally lifted with surprisingly little fanfare. It becomes common to see cannabis products in convenience stores right next to cigarettes.
8. Solar continues to improve and gets ridiculously cheap. Installing a grid-tied, or even non-grid-tied, system becomes a common home improvement. Tesla will either lead the way or exit this market.
9. Nothing crazy happens with quantum computing. Some niche use cases are found, but by 2030, RSA or other algorithms based on prime factorization remain safe ways to secure data.