In principle, eventually, it might be possible to reuse many different types of licensed and unlicensed spectrum, not just Wi-Fi but also licensed spectrum, including even licensed mobile spectrum
Though much attention now is paid to potential use of licensed assisted access to allow Long Term Evolution devices to seamlessly bond Wi-Fi (at 5 GHz, most likely), the mobile industry also is looking at ways to enable third parties to share access to mobile licensed spectrum, when license holders are not using that spectrum, in much the same way that TV white spaces or LTE-LAA work.
So you can see where the principle of dynamic, shared access is headed. No matter what the licensing model, communications spectrum–licensed or unlicensed–might increasingly in the future be opened up for sharing, vastly increasing the efficiency of communications spectrum, across many frequency bands, and despite the original purposes for which licensed or unlicensed spectrum originally was approved.
Moore’s Law makes it possible and affordable. Abundance is coming. It is going to change business models.