A report from Parks and Associates shows that only 2 percent of the public is using VoIP. That means there is alot of room for all of the carriers to grow in the residential market.
Marketing will be key to spawning adoption. As broadband from cable companies and DSL/FTTP proliferates then the market will start to see more rapid adoption.
While cost remains the primary motivator today for people to *SWITCH* over to VoIP, the future will be more driven by other factors, many of which have not really seen the light of day yet.