In many ways Bitcoin’s “invention” is much like the “invention” of the original iPhone, which required the latest technology (of the time) in order to be viable. An iPhone didn’t do anything we hadn’t seen from other devices: email, messaging, browsing, video playback, application stores … and of course phone calls. What the iPhone did was put it together in a fast, simple, and sturdy package, expertly designed and branded. It was a “new thing” that consisted of packaging together a bunch of old things. If the iPhone had not been released in 2007, something very similar would have been released in 2008, or 2009, or 2010 at the very latest, if not from Apple than another company. It probably wouldn’t have been so slick, but it would have had similar capabilities.