As a currency, it's a solution to a problem which doesn't exist (or rather exists in the mind of a few paranoiac libers).
It is a downgrade from current money,
with absurd confirm times and cludgy solutions to avoid them,
more complicated to use,
riskier for buyers vs. credit card and other payment processors,
rife with scam and fraud, without an issuing body to offer recourse/protection/body of law/enforcement of said law,
etc., etc.
Why should anyone be interested? Sure, once it was a way to avoid taxation, launder money, and buy/sell dope. Unfortunately, the loopholes it once availed are vanishing, making it far less attractive to those on the fringes of law.
Bitcoin is fascinating, it was a marvel in its day, I will forever be grateful to it for the education and the $$, but I'm afraid it's getting late.
Blockchain technology in different forms may take off, but that's a different topic.
Nobody knows what bicoin could become in the future... development is still in progress. Sure it needs to be tweaked, but the idea is great.