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 is cardano and ethereum is ethereum. Cardano will not able to over take ethereum in any days. If cardano develops itself a lot in the next five years and strengthens its ecosystem, meanwhile Ethereum will develop itself a lot more. It's not that Ethereum won't think of their own development or that they won't think of something new for their blockchain. Ethereum is at least 5 years ahead of cardano. So cardano will never overtake ethereum in any days