I am sure that the blockchain will be used in a total of 10 years, this is what makes crypto continue to prosper, buying and investing top ranked coins is a good thing to get big profits.
You are right. now is the investment time because the altcoin and bitcoin prices are still cheap in 2017. we will see ATH back in 2020-2021
of course bitcoin and altcoin will have a long future. because this is a journey just beginning. not so direct. because bitcoin is certainly still in demand by many people every time. Of course I am still sure that crypto will last a long time. it's just that for now we must be patient and do the best for us personally.