Yesterday, Vitalik Buterin published a great article called “A rollup centric ethereum roadmap”
He said that the Ethereum ecosystem is likely to be all-in on rollups (plus some plasma and channels) as a scaling strategy for the near and mid-term future .
I agree on his opinion. It seems that a Rollup is a key success factor and we are working on the Optimistic Virtual Machine on Polkadot now. Optimistic Rollup is a subset of the OVM. Imo, Polkadot cross-chain message passing (XCMP) will be realized on the mainnet 2020Q4 or 2021Q. This is much faster than ETH2.0 (mainly ETH1.0+Sharding). If we can make Rollups (Optimistic Rollups and ZK rollups 2020Q4 or 2021Q1), this is huge for the community.