I never take anything as a definite, just because I honestly think anything could happen. Plus when im talking about cryptocurrency im talking about mainly open public distributed ledgers, which I think do have a potential to become less mainstream than private blockchains. This is an unpopular opinion that many don't share with me, but people using private blockchains many times can do it cheaper and the tech has to just be good enough. It is far more inferior than open public blockchains, but they will still find a place. Im just hoping that big companies don't accept them as the standard.