It's either going to get adopted really quickly or it's not going to be adopted at all.
This sentence reminded me of this quote by Satoshi:
I'm sure that in 20 years there will either be very large transaction volume or no volume.
I agree that 100 years is too long. Hashrate is increasing. Number of transactions is increasing. Adoption is increasing. As the article goes on to say, Jack Dorsey (CEO of Twitter) thinks there will be a single global currency within 10 years, and it will be bitcoin. I think 10 years is too soon for bitcoin to be a "single global currency", but we will certainly know in 10 years whether it is heading that way, as Satoshi predicted. I suspect it will be.