I think it's a safe bet that at some point we may see a compilation of demos or something along the lines of what we've already seen with George & John's "Early Takes" collections. Even if we don't get a complete collection of White demos, it would be nice to have a one-stop career-spanning smattering of demos and early takes.
Anthology covered a lot of this territory, but those were released almost 20 years ago now. I think it's forgivable at this point to use Anthology tracks to pad out releases of other notable material.