2019 will have many of big coin as Telegram, Facebook... What will happen to the remaining altcoin?
what will be your basis that those altcoins will gonna die next year? I don't think so, maybe those projects that has no products will surely die but those solid coins like ethereum, litecoin and many others will survive. If you want to invest choose those currency that has live product as this will become huge in the future.
The basis is simple understanding on what is happening on ICO space since you will find out that there are so many scam coins which will die instantly without reaching the year 2019. And would strongly believe that ethereum and litecoin together with the other top listed coins will stay ahead since their supporters/holders will lift it up to gain more in future.