I don't think there is any loss of significant future opportunity. When someone will be able to afford the Internet, they will start using whichever service they find fit.
Till then for those people, I can't overstate how important free access to even this limited Internet is. Even free access to wikipedia and facebook helps a lot of people in a lot of ways.
Fun Story: One day I was with the brother of a friend of mine. He said facebook helped him a lot in SSC preparations. I thought he was joking, but it turns out that there is an entire ecosystem of services on facebook which help several people in several ways and for those people, this free access matters a hell lot.