internet (web / networking) is something that could not be avoided in humanity but crypto-currencies.. not necassary
Everything considered "essential" to modern life at present was seen as nothing but an expensive toy in the beginning.
web / networking meaning networking and communicating with human species all over the world is an expensive toy?
Yup, was in the early 90s. Toilets were an expensive toy when you could just as easily shit in the gutter.
Point being, crypto curriencies seem like a "neat toy" right now, but kids born today will think that pieces of paper with numbers on them a retarded and backward form of money.