I believe you are all wrong to expect crypto currency to have the same adoption curve as technology.
And why do you believe this?
Don't compare/use a standard technology/innovation adoption curve.
Crypto-Currency is no standard incremental innovation, like a new webservice getting traction, based on known technology and some improvements change.
Crypto-Currency is an breakthrough innovation ("basic innovation") and should be compared to the diffusion model/curve of other highly disruptive technogly, based on experience in the past.
I think that CryptoCurrency will have such a profound effect on society that they may never decrease in popularity. I guess it'll be like the adoption curve of the internet, which is closer to the adoption curve of a religion than most technologies.
Most technologies rise and fall, with a few left over to pick up the pieces. Very few technologies, less than 1% actually carry on being used. I would argue that the Internet is an exception to the rule, and that CryptoCurrency will be the same.
I expect the set of {CryptoCurrencies} to be the dominant form of currency and commodity of which all things are priced and bartered against within the next 40 years.
Within this set I see only the currencies that keep on moving to actually compose a significant chunk of that total set.
If I were a large holder of Bitcoin, I would fund research into side chains and side trees, and then start a media campaign against the official form of Bitcoin and attempt a hardfork to a new Bitcoin that had the ability from that point onwards to assimilate all other coin technologies. I believe that these competing CryptoCoins are in a war with each other, a very competitive war. That is why I argued earlier that if Monero were to adapt to new threats, that we attempted to make this the coin that would fight back, then we might have a chance of being a large component of the set of CryptoCurrency in 40 years time.
I think Ethereum is on the right track, but I am not entirely sure their solution is the right one. If I am right, and the future is a pure CryptoCurrency that enables a computing platform beside it, then Monero could be that currency, and we could do it without needing any ability for advanced scripts.
I am not convinced combining the platform and currency is the correct solution.