Would that lead to some kind of hierarchy like:
fedoras grub: -> kernel x.yy.z -> kernel a.bb.d -> Windows -> OpenSUSE -> Ubuntu
Where OpenSUSE and Ubuntu link to their own grub (or whatever)?
If thats it, it sounds sane to me. What would be needed? I guess one could iterate over all bootable partitions and add them to our own bootloader. That would not _need_ any interaction with any other distro, but if they could adopt that mechanism, the above tree would become navigable as OpenSUSEs grub could link back to fedoras, right?