Do you think cardano will over take ethereum in terms of tech with voltaire being worked on this year. Along with erc20 converter for easy conversion to cardano via ethereum. 
Cardano has a very slow development that actually they recently just have a working smart contract for there blockchain last year even there project exist for a long time. Cardano will never overtake Ethereum on the number 2 spot however it has a lot of room for price growth in the future since its price is not fully discovered yet compared to Ethereum. ADA has an advantage in terms of investment profitability but surely Ethereum will always be the number 2 on the ranking since its the father of smart contract blockchain.
Nothing can beat being the first mover in crypto.