there are two possibilities, either BTC and some altcoins will reach new highs, or PoW powered cryptos will disappear, since the reward will be too small for miners to be profitable, i do believe that BTC is here to stay, so you can figure out the answer
It's not small, the current price of BTC today is very huge so even it's halved already, they can still make a lot of money from mining. Yes, new ATH will be occur this year and hoping that it surpasses that recent ATH which is almost 20k dollars.
What happened in 2017 will happen again in 2020, let's hope for it.