I disagree- it's actually increasingly important for them to return the big boys.
In addition to the stupid (and growing) number of people that type domains into Google, there are people who know that Google will return results for what they meant. It might infuriate us, but most people are glad to have their poorly constucted queries give them back some some useful results. Most destination sites use traditional IA techniques to index their sites.
For Google to remain relevant, they must deliver up their best guess of what the user meant, from the best selection of sites the user might want to visit.
Which is depressing.