Here is a description of the rapidly moving pace of technology and the effects that it may have on leading PBX companies. VoiP and UC services are expected to continue to grow in coming years while the PBX market will continue to shrink. As such, the article goes on to postulate that leading PBX companies should consider making a jump to VoiP or UC services, if they have not planned to do so already. There is still a market for PBX companies, clearly, but this will dry up as time and technology advances.

Read the full article here:
http://unified-communications.tmcnet.com/topics/unified-communications/articles/380305-pbx-market-cant-stand-against-uc-sales.htm