Good example. It seems that the unexpected tends to happen while the 'expected' as touted by futurists tends not to happen. Of course memory is selective, and we tend to recall those things that are most frustrating and most unexpected.

Expecteds touted by technologists that didn't happen...(Yet, in some cases)
1. Household robots (circa 1970s)
2. Space staions (robust ones, not Skylab IIs bereft of science)
3. Lunar bases
4. Manned expeditions to Mars (circa 1980s)
5. CATS...Roton, et. al. (circa late 1990s) (orbitals, not Redstone IIs)
6. AI (predicted every decade starting in the 70s)
7. THE cure for cancer
8. Fusion power
9. Coming Ice Age (1970s hysteria)
10. Population explosion/crash & depletion of resources (by 1980s/90s q.v. Paul Erlich)
11. Electric cars (fuel cell expectations during 70s gas crisis)
12. SETI results (read the enthusiastic prognostications from the 60s & 70s)
13. Communications with Dolphins (remember Lilly et. al.?)

Unexpecteds...
1. Cell phone industry & pervasive acceptance
2. Personal computers...every workplace desktop computers
3. Internet for the masses & the WWW
4. DNA analysis...criminal tracing applications
5. MRI scans
6. Exoplanet discoveries, esp Hot Jupiters totally unpredicted in Sagan et. al. computer 'models'
7. Dark Matter & especially Dark Energy (is it real?)
8. Geysers on outer planets' moons (Io's geysers predicted shortly before encounter by a lone group of astronomers)

Certainly an incomplete list.