It HAS been the biggest wealth producing opportunity of the LAST decade , along with Bitcoin.
They are now both priced for world changing paradigm shift and perfect execution doing so. Which means that there is no wealth producing opportunity at all considering that you need everything to pan out great just to mantain the current valuation.
Also everything is an S-curve and once you arrive to 750bn (or whatever they crypto-marketcap is) there is physically nowhere to go to from there.