I'd argue Bitcoin's greatest security flaw is in full node bandwidth consumption pushing users to light clients or, far worse, online wallets, negating many security advantages baked into full-node clients. For those of us without true broadband options, syncing up to the network is almost impossible without a physical bootstrap option (which some in the community do actually offer, but which is perhaps too much to expect a new, casual user to find and use), and with ~half the world still with no connectivity options at home, it's not difficult to argue the current lack of global connectivity is significantly affecting adoption.
Satellite ISP is currently too expensive and usually too limited in bandwidth allowances to sync up to the network within a month, while ~30% of the US still doesn't have access to DSL or better (DSL itself not making a full sync particularly attractive). A large part of the issue is that the satellites are far, far, far away from houses - tens of thousands of miles. Musk's vision is to have relatively cheap and tiny satellites operating, say, 1,000 miles away from the average user, still allowing unobstructed point-to-point communications between satellites without the massive latency gain from doing so in the conventional satellite PtP configuration.
“The speed of light is 40 percent faster in the vacuum of space than it is for fiber,” Musk says. “The long-term potential is to be the primary means of long-distance Internet traffic and to serve people in sparsely populated areas.” Branson is investing in a similar solution.
http://www.latimes.com/business/la-fi-satellite-entrepreneurs-20150117-story.htmlhttp://www.businessweek.com/articles/2015-01-17/elon-musk-and-spacex-plan-a-space-internet
