package/app install/updating is critical to how a distro does everything it does. So to suggest more collaboration between distros is to, implicitly suggest collapsing distros together.
What's the major distinguishing factor between debian and fedora?
dpkg vs rpm.
Why would debian want to switch to rpm? What does it do for them to have to retrofit a million things into new processes and new behaviors?
Why would fedora want to switch to dpkg? What does it do for them to retrofit a million things into new processes and new behaviors?
So, what is the incentive for a distro that wants to survive and be independent to collaborate on this kind of technology?
There has to be a big win to the technology to promote collaboration and thus far there's been nothing.
I suspect that the pain of migration will continue to outweigh the benefit of the technology and what is more likely to happen is that more and more of the major distros will die out due to external economic realities until the options are winnowed down. Then cross-distro collaboration is less important.