Some users might argue with what I'm about to say, but the biggest weakness has to be the manner in which most users view it as a store of value... The vast majority of people ^{[especially in the past few years]} prefer to hodl it, as opposed to actually using it!

Considering that the easiest route is through the use of traditional methods, only an insignificant portion of it involves Bitcoin ^{[some government officials exaggerate the numbers, but there have been multiple research studies with different results]}.