Hopefully future versions of Netscape and MSIE will replace the auto-expansion feature with increased support for search and directory engines. The MoU is intending to experiment with many changes all at once, with various members of the RSC coalition are intending to try various different experiments of their own. If some of these turn out to have unexpectedly bad consequences, the existing gTLDs aren't necessarily affected. Few companies get the exact 800 number they want. That is the way the world works.
Some folks just get there first.
These are interesting examples that you used, because they're both ultimately counter-examples to your own idea. Because few companies get the 800 number they want, and because it's harder and harder to get anything even close to the number they want as the supply of available numbers dwindled, the system was expanded. There's now an 888 area code with the same purpose as 800. The restaurant example is even more interesting. When a popular restaurant row runs out of space for all of the potentially great restaurants that want to move there, eventually a new restaurant row springs up.