Andy Abramson @ VOIP Watch hits the nail squarely on the head about VoIP Providers:
"Market differentiation--everyone is a VoIP Reseller. No one is a market specialist. As a result it becomes hard to find the right VoIP Reseller to talk with. Companies reselling VoIP need more market focused messaging to drive their service offerings and availability." "If companies can get past the "if we build it they will come" mentality and instead start to niche, target and diversify their marketing, they will find the customers are there. But waiting for those buyers to find them won't be an easy way to do it."
Personally, I think it is on it's knees. TV, broadband and cellular are flattening. Wireline and LD is shrinking. ARPU isn't increasing in most cases. And the old guard doesn't want to learn new tricks, except to wall gardens. The companies that can combine Voice 3.0 and Web 2.0 technology with their services will easily win niche markets.