@fuat2mb
Well, I don't know about "market" relevance, but for me, #XMPP is how I chat with friends and family. @prosodyim's suite of "invites" modules has been hugely helpful in getting people signed up with accounts, even those with old phones and no special technical skills.
But an all-in-one #XMP2P app might make it even easier to get people using it, and wouldn't require anyone to be a server administrator.
I guess, in cases like mine, the network effect hasn't been particularly relevant, except within my circles of family and friends. But I do occasionally participate in public channels, or chat with people I've never met.