You miss the fact, that Ethereum had much more devs than other 3 project. For me ETH is still the future of smart contract.
ETH definitely has the advantage that they are in the leading position for smart contracts and ICOs at the moment.
So as long as other projects don't do thing significantly better than ETH they will not overtake it.
Yes, even though they will develop what they mentioned in the roadmap will not help to cross the value of ETH because ETH is already established which has more active developments from the team. Even though ripple has increase volume but it will cross the ETH position in long-term.