Some thoughts: VR, fusion, non-refrigerant cooling technologies, personal genomics, silicon-on-sapphire ICs, every drug and treatment that is just around the corner, quantum computing, CO₂ capture, failed Google projects such as Google Glass, Google Wave, Google contact lens glucose sensor.

Social media that aligns with human needs, permaculture farming, digital voting systems, smart contracts.

optical computing, custom printed medication(s) pills

I think optical computing is in the exact opposite of the situation the OP describes.

We have known how to do it for a while now. There are just not too many applications where its strengths are more important than its drawbacks.

Nuclear energy (new OR existing technologies)

Choose your own adventure games.