Although the fallback was activated, strictly speaking, an emergency upgrade has not been performed. The contracts deployed on op-mainnet have not been changed from those approved in Protocol Upgrade #7: Fault Proofs. The ability for the Guardian or Deputy Guardian to switch to the permissioned fallback was built into that proposal as part of a staged, responsible rollout of fault proofs.
That said, other applications that are using the OptimismPortal.respectedGameType will be affected by the change and need to wait for new dispute games to resolve. The exact impact will depend on the details of the application and how they’re using dispute game results.