As you stated,it's more beneficial for Hive DApps to go multichain as it helps market to the outside people not on Hive.
I am sure many people have realized the benefits of Hive through interacting with Hive DApps like Splinterland and Leofinance on other chains.
So going multi chain should be a priority by the devs here.
Posted Using LeoFinance Beta
Yes. We might also need smart contracts like EVM chains to add more depth to the base layer.