Except if a particular coin is ruled illegal because it is a security risk...it will NEVER be accepted by your neighborhood coffee shop...Overstock...or ultimately some place like Amazon.

So its "success" will be limited to the world of a "Silk Road 3".

Edit: Furthermore I am no intellectual property rights expert...but I do wonder what if any rights Johns Hopkins University might have on the development of this technology...and therefor say on its release and  further development. I think at the very least they will be thinking about public relations aspects at this point because of their tie to its development.