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. 
The thing here is that once a tech got popular, another company will try to adopt it too. I don't think Cardano will have a significant lead in technology, especially when ETH also has expert developers on their side. Yeah, they might have a little bit advantage but that doesn't mean much to the masses. It's the trust and utilities, especially when convenient enough, that's going to win in the end.