The way I see it, Bitcoin is a revolutionary in a lot of ways.

From a technical standpoint it proved a novel solution to the Byzantine Generals problem. Cool.

From a political standpoint, it allows people to own and transfer capital largely outside the control of the state. Also cool.

From an economics standpoint, it allows rigid, non-repudiatable contracts between entities. It allows moderately complex multi-party control of capital. It enables some fundamental contract logic. All very cool.

Now, is it suitable for everyone on Earth as a means of transacting their daily business, thereby potentially replacing all other forms of money? In its current form, no. Early on, it wasn’t clear what niche it would end up filling, so it was entirely possible that the protocol would grow to support the transaction volume necessary for that to happen and the ecosystem would grow around it to make it happen. That obviously hasn’t happened and I don’t see any reason to believe it will in the future.

If Bitcoin continues to serve in the roles that it serves today - as a store of value outside state control, as a means of transacting, as a vehicle for speculation, etc. - then I would call it a success.