One of the most powerful things will be able to get variables from specific contracts on different networks in a reliable way(with witness verification). We just had someone finish up Open: ICDevs.org - Bounty #16 - EVM Witness Library - $8,000+, but a bit of infrastructure around it so that I can ask things like "give me the value of the owner value of token id “X” for contract “Z” on polygon would really explode what we are able to do.
edit: Put another way…we want to call pure functions and/or access variables on contracts on different networks and have the RPC canister do the witness validation and block height confirmation.