As you might have seen with the picture above, there are few factors that need to be considered when mining using NiceHash. Price of Bitcoin, Difficulties, and Market price of each algorithm.
Mining speed might stay the same, and it did! However, buyer inside NH market will decide whether to buy your mining speed expensively, or as cheap as possible, depends on the demand and supply of the market. I have been through when a GTX1080 only produces less than USD2 daily, and have seen the same card juicing USD7 daily! Keep that in mind. 2018 is a promising year for Cryptocurrency. With Russian and Indian Prime Minister hinting the acceptance of Crypto, we might will see these digital currency boom out even further later this year. Who knows if BTC can just be traded above $100,000 in a few month? Your 0.001 BTC might worth $1000 soon, which only a few dollars currently.
HODL or not? it's your choice! :)