[AnimalMuppet]

Depends on your definition of "fizzle out". If you mean "not dominate the future, but be relegated to merely a niche tech", then:

Ruby on Rails. Modula-2. Every JavaScript framework since ever. Supersonic passenger flight. Space tourism. Emitter-coupled logic. Gallium arsenide (still has my vote for a name for a speed-metal band). Musk's Boring Company. I'm sure I could go on with some more thought.

[senordevnyc]

I didn't understand the comment to be about specific products, but more overall categories. I think space tourism is likely going to be a huge category, it's just decades away still. I don't know about supersonic passenger flight or building tunnels everywhere. It may never be worth it for those categories.

But regardless, I don't think that many people really thought Musk was going to build much with Boring. I certainly didn't.

And has anyone in the last three decades (other than Boom's hapless investors) thought that supersonic passenger flight was going to be huge?