I'm only speculating here, but the business reason that PJTG fell apart could have been that RFID became ubiquitous. There were and are so many players in this space, the profits became pretty slim. Microsoft probably saw it as another freebie at that point.
Buzz is in a unique position as an up and commer. I think the market is already frustrated with ATT, Verizon and the so-so VOIPs out there now. I wouldn't be surprised to see one of the bigs snap them up once they gain marketshare.