{A major|A significant} {issue|problem|concern} {hindering|impeding|preventing} Bitcoin is {uncertainty|unpredictability} {about|regarding|concerning} its future. The {debate|argument|dispute|discussion} {is over|mores than} whether Bitcoin {will|will certainly} be {a successful|an effective} {long run|long term|future} {innovation|development|advancement|technology} or {fizzle out|blow over|die} {like so|thus} {many|numerous|lots of|several} {prior|previous} {innovations|developments|advancements|technologies}.