There are two senses of "inevitable" when used with technology. In the first case, an invention merely has to exist once. In that sense, every technology is inevitable because sooner or later some mad tinkerer will cobble together almost anything that can be cobbled together. Jetpacks, underwater homes, glow-in-the-dark cats, forgetting pills — in the goodness of time every invention will inevitably be conjured up as a prototype or demo. And since simultaneous invention is the rule not the exception, any invention that can be invented will be invented more than once. But few will be widely adopted. Most won't work very well. Or more commonly they will work but be unwanted. So in this trivial sense, all technology is inevitable. Rewind the tape of time and it will be re-invented.
The second more substantial sense of "inevitable" demands a level of common acceptance and viability. A technology's use must come to dominate the technium or at least its corner of the technosphere. But more than ubiquity, the inevitable must contain a large-scale momentum, and proceed on its own determination beyond the free choices of several billion humans. It can't be diverted by mere social whims.
