Please see edit of my comment. Since it seems my point did not get across, I elaborated. Of course there are plenty right now since there are no barriers yet.
GrapheneOS is not limited by Google, as long as the bootloader is unlockable and Google contnues releasing the sources.
Longterm, the GOS project needs to support alternative hardware platforms.
There are Linux tablets, so if Android is dead open source developers will support these.
I’m writing this on a GOS Pixel tablet with only free/libre installation sources. There are quite enough applications to install.
Please see edit of my comment. Since it seems my point did not get across, I elaborated. Of course there are plenty right now since there are no barriers yet.
GrapheneOS is not limited by Google, as long as the bootloader is unlockable and Google contnues releasing the sources. Longterm, the GOS project needs to support alternative hardware platforms.
There are Linux tablets, so if Android is dead open source developers will support these.
I think the problem is your second assumption of “will continue releasing sources” is the one to fail.