Based on every attempt to make VR or AR a ubiquitous thing, historically. The hype and the market do not align, but the R&D budgets are never bottomless while they wait for a market to materialize.
The iPad is actually a fairly good example. People have predicted that a tablet form-factor would one day be a popular form factor. Sci Fi has had it for ages -- the Star Trek PADD, or similar. And there were other tablets out there doing reasonably well. If you include e-readers, tablets might even sell in a volume that would chart well against phones or laptops. The iPad annual sales are something like 50M, which is nothing to sneeze at.