Your are right we should not depend on steem to fulfill over needs in life
Steem or steemit is a project currently under development and people who invest their time and resources in it they are hoping one day they will get good returns on their investment
,but there is no guarantee of return so consider it as a investment as all other investments with all the risks
Over life should not depend on steem and any other same thing considered it as a long term investment and savings but not as a emergency fund, steem is not a hundred percent secure and reliable investment you can earn millions if this project goes to mainstream and you can lose everything if this project flops
This could not happened only with steem it can happened with any cryptocurrency and blockchain related project or any other online earning business