Definitely agree that an industry-standard format for part footprints is long overdue - isn't this the sort of thing that JEDEC should be doing?
Ease of part creation is one of the most important features of a PCB editor as there will ALWAYS be new parts that you need to create yourself.
I'm not sure DXF is a sensible answer, as it is a pretty poor standard, with many version and compatibility issues.
DXF is already established, and it is not so much a poor standard, as no rules around using it for more intelligent PCB footprint extraction.
It works fine already, for outlines, and PAD centres and diameters.
Which is why I suggested
tiers of DXF - the simplest DXF, are the most portable, and have similar IQ as a HPGL or Gerber file.
Next step is to have polylines, Arcs, width and layers meaning something.
Again, simple rules with examples help here - and a lite-2D package with Footprint helpers could help vendors create rule-meeting DXFs.
Then the top level uses blocks, and that can insert full drill/mask stacks at pin locations, with enough inbuilt rules a compatible PCB tool can load directly as footprint.
To get this from Vendors, I think Autodesk needs to supply a footprint-2D package, where they can view the stackup in quasi 3D.
I have seen complete PCB's exported as DXF, so you can embed enough information to manage complex structures.