Now a days, new altcoins that promises to surpass existing ones appears quite frequently, but in reality they only aspire to complement the shortcomings of the leaders without ever aspiring to displace them.
Admittedly, there are altcoins that at least theoretically are technically superior to bitcoin and ethereum (the two heavyweights of the market), but the market of cryptos is very unique and seems to value much the antiquity and the accumulated prestige before its technical deficiencies.
I think that Cardano's greatest aspiration would be to displace NEO, but never to ethereum.
The real king of cryptospace
cardano is already superior to NEO and it will stay that way
about ethereum - they will co-exist
cardano is not trying to be eth competitor.. its trying to solve things that eth can not solve
cardano team actually has eth developers inside them.. (in IOHK.io/team)
NEO was out to the market a long time ago, but ADA was in the development for 2 years.. even more
think about it.. they made much more work with this amount of developers