Anyone who thinks that VoIP services for long distance and international calling are going to continue growing unabated is sadly mistaken. Anyone who watched the battles in the late 1990s between independent DSL providers and local and regional Bell phone companies knows that these one-time monopolists can play hardball with the best of them, and this isn't about to change.
The future of VoIP is clear. No matter who invented or thought of it first, the telcos will own it. You'll be getting your VoIP from them eventually. They'll buy out the more pesky competitors and trick or ruin the others. A few cooperative small fry will be allowed to exist as tokens to show the world that there is an open and competitive marketplace.