I've had my Goggles 2 bound to my O3 units and my V2 goggles bound to my vistas just to keep everything separate up until now, but now I'm considering just using the Goggles 2 for everything.  However, I have a couple of quads that are sealed and I can't get to the bind button.  

If I bind one of my other vistas to my goggles 2, will it automatically bind ALL of my vistas, so I don't have to unseal these couple of drones?

Unlike the DJI FPV Goggles V2, the DJI Goggles 2 retain their binding when switching between different firmware modes (i.e. Vista / O3 / DJI FPV Drone) so there is no need to (re)press any bind buttons on the VTX's. However, you will need to update the firmware on the Vista to V01.01.00.00 or later for them to work with the Goggles 2, and then you will have to bind each of your Vista's with that new firmware on to your Goggles 2. So to get all of your Vista's to work with your Goggles 2 you are still going to need to get to the bind button on each one, but it will be a one-time only bind for each one which you won't need to do again.

Thank you. I was afraid of that. One of the vistas is absolutely encased in thermal paste so I can't even access the USB plug to update. And there's quite a few vistas to update. Lots to consider. Thank you for your help!

You might find the cross-referencing compatibility chart below helpful, courtesy of Oscar