Actually in near future we're about to face mass unemployment while the population will gradually increase, so alternative sources of income should be introduced. Blockchain tech is one of the solution for that, though as everything else it also has its cons, such as lots of shit-coins pop up everyday. But it still has room to grow and solve the major problem that we're about to face in near future. To name a few promising crypto I'll say ETH, EOS, STEEM etc. they're trying to create an ecosystem, though lots of of work still needed to be done in order to make them adoptable by everyone. More promising projects will surely be introduced in future, so may be one day it'll become a viable source of income for everyone.