Time for a new TLD
If we can't keep our .orgs, how about we get a new TLD set up, which will be legally (and unbreakably) tied in to the non-profit ethos (hah! No, not that Ethos))
It needs to be similar to .org, and carry the message that it is quite like .org - can I suggest .org-y or, if hyphens aren't allowed in TLDs, plain .orgy - I think it could attract a fair bit of traffic.