I just can't say about exact numbers but I think 2019 and 2020 will be really good for such next coins like Litecoin, Ripple and Ethereum. Altcoins started to rise up from New Year. Might be so good.
I agree that these coins showed a strong trend in the overall growth of the cryptocurrency market. I think that in 2020 we will see the price of Bitcoin more than 7000 dollars.