VoIP to go mainstream within a decade - mass migration expected

Analysts predict that Voice over Internet Protocol (VoIP) will go mainstream within a decade. This year till 2009 will be the consumer and small business VoIP ramp-up period, while migration to VoIP will peak between 2010-2014. The migration time frames of VoIP could be either accelerated or delayed, depending on a carrier's strategy for migration to a next-generation network (NGN):

"A carrier's NGN migration strategy is heavily influenced by factors such as the cost of maintaining the Public Switched Telephone Networks (PSTN), available investment funds, technology, regulatory policies, pricing trends and competition," said Keith Nissen, an In-Stat analyst. "Each carrier will develop its own unique NGN migration strategy."

More details at Tom's Hardware