I found the history of railways and dot com surges insightful and entertaining. To pinpoint exactly where we are in the evaluation of technology I find complex and I question anyone that says they have it figured out completely. Excitement, publicity, and hype will tend to get us ahead in valuation of the true progress of a technology. I don't completely agree with the article I'll mention here but I think it is good to look at things from all sides, not excluding things because of our core beliefs. Bubble Warning Article: https://twitter.com/MarcusWahl1/status/947484019167395841