There are many online business coming and disappear over a period like matrix, revshare and the current trend is bitcoin & altcoins ICO projects. Imaging if btc or altcoins projects disappear over a period what would be the next preference to earn online. because very few people identified blockchain in the year 2009 and got some BTC now they are millionaire. similarly do we have any idea of what could be the next technology / business we can expect in future.
An interesting question, as also the people who have made up to this, time does not stand still, take something new will come up now and forward.