The forgotten element here is that ideas start out at their worst, and then evolve into something better and better. This sometimes happens due to better technology, more scale and cheaper costs, better applications for the product in question, or more familiarity with the product combined with great marketing. On the investment side, the euphoria fez are getting in, but there is no euphoria and astronomical returns yet. In some cases, investments have made decent returns, but not enough to sway the masses into jumping in. This is analogous to the slow internet connections of the 1990's, internet sites crashing or information being incorrect on search engines. In the cryptocurrency world, it is being witnessed by high mining costs for coins, slow transaction times and hacking or theft of accounts.
Word starts to get out that this internet and ".com" is the hot new thing. The products and tangibility is being constructed, but due to the massive scale involved, the cost and time expended would be massive before everyone is using it. The investment aspect of the equation starts to get ahead of the business development since markets discount the potential of a business with the price of the investment. The euphoria is starting to materialize, but only among the early adopters. This is happening in the cryptocurrency world with the explosion of new "altcoins", and the large media press that the space is getting.