Nothing stays the same for very long and technology tends to be hyperactive in this regard.
But that doesn't mean change is random or irrational. In fact, although the pace of change may vary it follows a predictable path. For wireless technology, I think we are entering a phase of convergence. It's a natural of competition.
One factor driving convergence in the wireless space is limited spectrum. Global rationalization may be a pipe dream but I think we are going to see technologies finding ways to work with each other simply because they can't occupy the same spectrum otherwise.
Bluetooth, to cite one example that has come up a lot recently, will merge into UWB. That's not to say the market for chips and systems will disappear. It will just be a subset of something else that, in fact, builds on what Bluetooth has already accomplished.
A more difficult call will be on how Wi-Fi, WiMAX and other fixed wireless technologies will play out. We published an interesting op-ed piece on this recently, David Witkowski's "Why say Wi?" in which he wonders out loud why cellular isn't a better choice of muni and campus deployments.
You can find David's article at Why say Wi?.