Hi.
It sounds a lot like something happened to the Hue hub, since all 7 of your lights became unreachable at the same time but still come on with the wall switch.
Replacing the hub can definitely be a pain. However, you might be able to migrate from the old v1 bridge to the new v2 bridge. There are instructions on how to do this here. That should (in theory anyway) save you from having to make changes in Indigo other than specifying the new bridge's IP address in the Hue Lights configuration. However, if you can't migrate the v1 config to the v2 bridge, or the migration process changes the device ID values (which is what the Hue Lights plugin uses to identify each device on the Hue bridge), you'll have to manually change all 7 Hue Lights devices in Indigo to point to the correct Hue devices on the new Hue bridge.