I am against using ETH as a native token. Originally, the rationale for EVM support was to make it possible for Ethereum DApps to migrate to NEAR without them having to rewrite, retest and reaudit their code. However, if they keep using ETH as a native token (and thus not touching NEAR token at all), they would be more like merely offloading their smart contract computation to NEAR blockchain (where it is cheaper). Migration should involve more than that, in addition to moving the computation it should involve switching to the new blockchain’s native token. Otherwise, it is like moving to another country while still using the currency of the country you came from.
Also, the way we are planning to implement it (with EVM runtime calling NEP-21 functions), we are making the exact implementation details of the JSON implementation that we use part of our consensus protocol, and it is likely not designed for that (for example, it may possibly change its behavior between versions).