Since it's old and no longer relevant to the Google, it would be really interesting to have that code in some kind of code museum, as I feel it gave an interesting insight on how Google did big data (the real one, not the marketing one) back then. Not sure it that's feasible, but I guess it doesn't hurt to ask.
I wish, but it's unfortunately not my call to make. A few other companies have done this, eg. Microsoft open-sourcing Altair Basic about 30 years after it came out or id open-sourcing DOOM. Maybe if I ever go back to work for them, I can propose it. For now, consider getting a job at Google if you want to peek into the VCS history.