Ethereum will be much more valuable than today when it change their algorithm from pow to pos. so it may make sense to invest between 2019 and 2020. Vitalik have been working hard for ethereum.
Not only Casper POS there will be ehtereum max supply limit . Vitalik already announce he will fix it for 100 Million but couldnt able now he is working hard to limit max supply for 130 million . Once it happnes ethereum price will skyrocket for sure.