Anyone who develops a new technology is sure that it will be a hit and change the world in some way or another. The public isn't so sure, and it often takes time to win us over. There are plenty of products that turned out to be not so cool or useful (or even dangerous) in the long run, and they fell by the wayside. Then there are the products that eventually became ubiquitous, and looking at the backlash in hindsight can be a hoot.
Yeah, early predictions can be hilariously wrong, even when they come from those who have something to lose if the product succeeds. See a list of 15 such products that faced initial backlash at Cracked.