Too Long; Didn't Read
Blockchains depend heavily on network effects, i.e. the notion that networks such as telecommunication services, the Internet, or social networks become more valuable when their number of users grows. Ecosystem building is one of the main factors that drives the value of a Layer 1 blockchain enterprise. As such, I don't think that there are smart contract platforms in the race viably contending to be an "Ethereum killer" The only blockchain that will eventually kill Ethereum is Ethereum 2.0.