Earlier quoted context omitted.
I would invert the question. What's wrong with more options? The thing that really strikes me every time the new TLD subject comes up, is that there's always a percentage of people who want to forbid creation of certain TLDs for unpredictable, idiosyncratic reasons.
Automatic spam filters and search engines are going to down rank them heavily. It's hard to automatically evaluate domain names such as xkcd but anything under .ecom is probably trash.
Anybody could have any number of reasons for wanting a particular domain. Maybe someone will make the next del.icio.us? Maybe a TLD you don't like completes a word or phrase that makes a good brand, or is part of the next big viral trend that goes on to shape our culture in ways we wouldn't have anticipated.
Maybe people are just okay with being penalized by search engines because that's counterbalanced by other objectives. etc.