(And .edu?)
Ideally, we would never have had more than one TLD; even before the new rounds of TLDs showed up, people found it annoying and confusing to have example.org and example.com go to two different places. Why did we need more than one TLD in the first place, other than as a license to mint money in the form of domain registration fees? I don't think it makes much sense as an organizational mechanism.